Post-Nicene Controversies to AD 400

The succession after Constantine’s death is a separate event sequence and must not be collapsed into the death event itself.

Qualification: Later ecclesiastical carriers supplement rather than replace contemporary/secular chronology; exact succession acts are separately bounded.

Source loci: Breviarium 10.8–9 | Historia ecclesiastica 2.1–5

Constantine’s sons emerged as imperial successors after his death, and Constantine II died in conflict with Constans near Aquileia in AD 340.

Qualification: Ancient epitomes compress dynastic detail; territorial partition mechanics remain separately controlled.

Source loci: Breviarium 10.9 | De Caesaribus 41

Coinage and titulature provide independent material controls for the post-337 imperial college but do not by themselves reconstruct the full political negotiations of partition.

Qualification: Catalogued material evidence controls titulature and sequence, not private motives or complete partition negotiations.

Source loci: RIC VIII: issues of Constantine II, Constans and Constantius II, AD 337–340 | EDH: imperial titulature dated to the post-337 Augusti

Later church historians preserve succession narratives but are not independent contemporary witnesses to every dynastic act.

Qualification: Fifth-century narrative dependence and retrospective theological framing must be controlled.

Source loci: Historia ecclesiastica 2.1–7 | Historia ecclesiastica 3.1–2

Constantius issued letters recalling Athanasius and authorizing his return, as preserved by Athanasius in his defence dossier.

Qualification: Athanasius is an interested party and transmits imperial correspondence within an apologetic work; the letters are evidence for the recall, not for every interpretation he attaches to it.

Source loci: Apologia Contra Arianos 51–55

Athanasius’s post-337 career involved repeated exile, return and imperial-ecclesiastical conflict rather than a single uninterrupted restoration.

Qualification: Polemical and commemorative sources require event-by-event control; the sequence is accepted without treating every accusation as verified fact.

Source loci: Historia Arianorum ad Monachos 1–35 | Oration 21.26–27, 33

Athanasius’s own dossiers are contemporaneous or near-contemporaneous evidence for documents and his perspective, but hostile characterizations of opponents are not automatically accepted as neutral descriptions.

Qualification: Rhetorical labels and motive claims remain source-attributed unless independently corroborated.

Source loci: Apologia Contra Arianos 36–55 | Historia Arianorum ad Monachos, passim

A later church-historical carrier reports that Constantius removed Paul and transferred Eusebius of Nicomedia to the episcopate of Constantinople.

Qualification: Socrates wrote in the fifth century; the event is accepted at moderate confidence while motives and party labels remain source-attributed.

Source loci: Historia ecclesiastica 2.7

The surviving Eusebian documentary and conciliar traditions support an eastern episcopal network around creed and deposition controversies, but not a single stable monolithic “Eusebian party” with uniform motives.

Qualification: Documents and later carriers establish relationships and formula circulation; network membership and intent must be reconstructed case by case.

Source loci: Letter of Eusebius of Nicomedia to Paulinus, preserved in Theodoret, Historia ecclesiastica 1.5 | De Synodis 22–26

Athanasius transmits multiple Antiochene creed/formula texts connected with the Dedication Council and its aftermath rather than one single Antiochene formula.

Qualification: Athanasius is a later polemical carrier of the texts; formula wording is stronger evidence than his interpretation of opponents.

Source loci: De Synodis 22–25

The long Antiochene “Macrostich” belongs to the mid-340s formula dossier and must be kept distinct from the 341 Dedication formulas.

Qualification: Numbering and council-association traditions vary; document clock and meeting clock remain distinct.

Source loci: De Synodis 26 | De Synodis 29–33

The ordering of Antioch meetings and formulae in AD 341–345 remains bounded rather than reduced to one uncontested session chronology.

Qualification: Later narrative carriers and formula transmission do not justify minute session reconstruction.

Source loci: De Synodis 22–26 | Historia ecclesiastica 2.8–9

The Sardica dossier records a divided council conflict and transmits synodal letters concerning Athanasius and other bishops.

Qualification: Athanasius transmits a partisan dossier; accepted facts are limited to documents and procedural actions they directly attest.

Source loci: Apologia Contra Arianos 44–50 | Sardica synodal letters, Athanasian dossier

Sardica canons 3–5 provide appeal/review procedures involving the bishop of Rome without by themselves establishing a later universal papal-jurisdiction model.

Qualification: Canonical procedure is local/conciliar evidence; later jurisdictional systems must not be read backward into the text.

Source loci: Canons of Sardica 3–5

The council belongs to the AD 343/344 corridor; this project does not select one exclusive year or a single uncontested session chronology at G3.

Qualification: Ancient dating systems and later reconstructions differ; the bounded corridor remains open.

Source loci: Apologia Contra Arianos 36–50 | Fragmenta Historica, Sardica dossier

Imperial action affected episcopal exile and restoration, including Constantius’s recall correspondence to Athanasius.

Qualification: Imperial letters establish interventions, not a single uniform imperial theology or hidden motive.

Source loci: Apologia ad Constantium 4–7 | Apologia Contra Arianos 51–55

Imperial constitutions in AD 341–346 show legislation against sacrifice alongside selective preservation of some temple buildings, demonstrating policy variation within the Constantian period.

Qualification: The AD 438 code is a later legal carrier; promulgation does not prove uniform enforcement in every locality.

Source loci: Codex Theodosianus 16.10.2–4

Constans and Constantius II cannot be collapsed into one stable church-policy program; surviving ecclesiastical and legal evidence must be attributed to specific emperor, place and date.

Qualification: Polemical narratives and legal carriers illuminate different domains and cannot be combined into an unqualified universal policy.

Source loci: Historia Arianorum ad Monachos 20–35 | Codex Theodosianus 16.10.2–4

The first Sirmium formula belongs to the AD 351 Photinus-related dossier and is textually distinct from later Sirmium formulae.

Qualification: Athanasius and Hilary are theological interpreters as well as carriers; formula text and polemical evaluation are separated.

Source loci: De Synodis 27 | De Synodis 38–61

The second Sirmium formula of AD 357 is transmitted as a Latin formula that rejects ousia terminology in the controversy.

Qualification: Labels such as “Blasphemy of Sirmium” are polemical reception labels, not neutral document titles.

Source loci: De Synodis 28 | De Synodis 11

The AD 358–359 Sirmium/Ancyra/Nike sequence shows shifting formula coalitions rather than one unchanged eastern party.

Qualification: Coalition terminology is source-specific; this claim does not infer identical membership or motives across meetings.

Source loci: Ancyra/Sirmium 358 homoiousian dossier | Dated Creed / Sirmium–Nike formula traditions | De Synodis 8, 29–30

Separate western and eastern council processes met at Rimini and Seleucia in AD 359.

Qualification: The surviving dossier is uneven and often transmitted through polemical carriers; detailed attendance and voting sequences remain open.

Source loci: De Synodis 1, 29 | Rimini conciliar letters/formulae | Seleucia conciliar dossier

Formula negotiation in 359–360 continued through the Nike/Constantinople Homoian trajectory rather than ending at the initial Rimini and Seleucia sessions.

Qualification: Document/formula clocks are kept distinct from each council’s session clock.

Source loci: De Synodis 8, 29–30 | Constantinople 360 Homoian formula / synodal tradition

Exact universal attendance counts, delegation sequences and vote reconstructions for Rimini/Seleucia are not selected.

Qualification: Surviving documentation is partial and carrier-dependent; numerical claims require source-specific adjudication.

Source loci: Rimini dossier, surviving letters and formulae | Seleucia dossier, surviving formulae and reports

Athanasius distinguishes between the terms homoousios and homoiousios and allows that some users of homoiousios may intend an orthodox sense when carefully explained.

Qualification: Athanasius’s conciliatory semantic argument does not prove uniform usage across all bishops or decades.

Source loci: De Synodis 41–42

Fourth-century formulae employ multiple technical terms and exclusions—homoousios, homoiousios, homoios and anomoios-related language—whose meaning depends on document and speaker context.

Qualification: No term is treated as a timeless party label detached from its textual setting.

Source loci: De Synodis 27–30, 41–42 | Eunomius, Apologia 7–12

Later pro-Nicene semantic stabilization is not retrojected wholesale into earlier 340s–350s formula disputes.

Qualification: The claim is a controlled diachronic distinction, not a denial of doctrinal continuity.

Source loci: De Synodis 22–30, 41–42 | Oration 31.1–30

The 381 canonical tradition itself enumerates several named groups—Eunomians/Anomoeans, Arians/Eudoxians, Semi-Arians/Pneumatomachi, Sabellians, Marcellians, Photinians and Apollinarians—rather than one undifferentiated anti-Nicene party.

Qualification: Canon 1 is a conciliar classification at a late-fourth-century moment; it does not define all earlier self-identities.

Source loci: Constantinople I, Canon 1

Athanasius frequently uses “Arian” as a polemical umbrella, so his labels require comparison with the actual creed/formula texts of those he opposes.

Qualification: Polemical naming is evidence for Athanasius’s taxonomy, not automatic proof of a single organization.

Source loci: Historia Arianorum ad Monachos, passim | De Synodis 22–30, 41–42

Hilary’s De Synodis directly engages eastern Antiochene and Sirmian formulae for a Latin-western episcopal audience.

Qualification: Hilary’s theological evaluation is partisan; the transmitted formulae and his reception of them are distinguished.

Source loci: De Synodis 1–4, 11, 29–33, 38–61

Hilary’s historical fragments preserve additional correspondence and conciliar material showing western participation in the post-Nicene controversy.

Qualification: Fragmentary compilation history limits reconstruction of an uninterrupted narrative.

Source loci: Fragmenta Historica / Collectanea antiariana Parisina, Sardica–Rimini dossier | Ad Constantium / Contra Constantium

Julian states that exiles under Constantius were allowed to return to their countries but not automatically to their churches, and he specifically ordered Athanasius to leave Alexandria.

Qualification: Imperial rhetoric is hostile to Athanasius; the order itself is direct evidence for policy toward him.

Source loci: Letter 24 to the Alexandrians

Ammianus reports Julian reopening temples and permitting sacrificial cult while also summoning competing Christian bishops, a policy he interprets as exploiting Christian dissension.

Qualification: Ammianus is a near-contemporary pagan historian; his motive attribution is his interpretation and is not independently adopted.

Source loci: Res Gestae 22.5.1–4

Julian’s educational policy sought to exclude Christian teachers who rejected the religious content of classical literature from teaching those texts.

Qualification: The scope and local enforcement of the policy must not be generalized beyond the surviving enactment and reports.

Source loci: Res Gestae 22.10.7 | Letter 36/61c on Christian teachers

After Julian’s death in AD 363, the army selected Jovian as emperor.

Qualification: Ammianus is a principal near-contemporary narrative; details of deliberation remain his account.

Source loci: Res Gestae 25.5.1–6

Jovian concluded a Persian settlement that ceded territories and required the transfer of Nisibis and Singara, with population displacement.

Qualification: Ammianus strongly disapproved of the treaty; the terms and his evaluative rhetoric are separated.

Source loci: Res Gestae 25.7.9–11; 25.9.1–13

Jovian died at Dadastana in AD 364; Ammianus records multiple reported causes rather than a certain mechanism.

Qualification: Cause-of-death alternatives remain open; only the death event and location corridor are accepted.

Source loci: Res Gestae 25.10.12–13

Valentinian I was selected emperor in AD 364 and elevated his brother Valens as co-Augustus, creating a new imperial division.

Qualification: Ammianus provides the principal narrative; private motives and exact factional negotiations remain bounded.

Source loci: Res Gestae 26.1–4

Ambrose later appealed to Valentinian I’s precedent that ecclesiastical questions should be judged by bishops; this is evidence for Ambrose’s remembered/legal argument, not by itself a complete reconstruction of Valentinian’s church policy.

Qualification: Ambrose writes later in a conflict with Valentinian II and cites the father’s precedent rhetorically.

Source loci: Ambrose, Letter 21.1–3

Valens was defeated and killed in the battle of Adrianople in AD 378, ending his eastern reign.

Qualification: Ammianus gives the primary surviving narrative; exact circumstances of Valens’s death were already uncertain in antiquity.

Source loci: Res Gestae 31.12–13

Basil’s correspondence describes severe ecclesiastical conflict in the East during Valens’s reign and appeals to western bishops for assistance.

Qualification: Basil is a partisan participant; his description establishes his network and perception, not every accusation against opponents.

Source loci: Letter 92.1 to the Italians and Gauls

Valens’s eastern church policy and coercive acts must be reconstructed locally and chronologically rather than reduced to a single universal “Arian persecution” model.

Qualification: Later church history and partisan letters require locality and dependence controls.

Source loci: Letters 92.1; 243.2–4 | Historia ecclesiastica 6.13–14

Basil participated in an eastern episcopal network that sought western support amid regional ecclesiastical conflict.

Qualification: The letters reveal Basil’s network and aims; they do not prove uniform agreement among all eastern bishops.

Source loci: Letter 92.1 | Letter 214.2

Basil’s De Spiritu Sancto defends the liturgical/theological use of “with the Spirit” and discusses unwritten ecclesial practices.

Qualification: The work witnesses Basil’s theology and local/traditional claims; it does not establish that every church shared every practice.

Source loci: De Spiritu Sancto 27.65–67

Basil’s ascetic rules attest organized communal ascetic discipline in his sphere rather than only solitary eremitic practice.

Qualification: Basil’s rules are normative texts for his ascetic setting; implementation elsewhere must be independently shown.

Source loci: Longer Rules, Questions 7 and 35

Gregory of Nazianzus’s Theological Orations articulate a mature pro-Nicene Trinitarian argument in Constantinople in the late 370s/early 380s.

Qualification: The orations witness Gregory’s theology and audience context, not automatic consensus across all churches.

Source loci: Orations 27–31

Gregory’s Oration 42 witnesses his withdrawal from his Constantinopolitan episcopal position during the 381 council context.

Qualification: Autobiographical rhetoric is direct for Gregory’s own action but not for exact council attendance totals.

Source loci: Oration 42.1–2, 27

Gregory of Nyssa’s Contra Eunomium witnesses sustained Cappadocian engagement with Eunomian theology.

Qualification: The treatise is polemical and must not be read as a neutral summary of Eunomius without comparison to Eunomian texts.

Source loci: Contra Eunomium I.1–4; II, proem

Basil and Gregory Nazianzen explicitly argue about the status, naming and worship of the Holy Spirit, demonstrating that pneumatological controversy was a distinct late-fourth-century issue.

Qualification: The writings represent pro-Nicene positions; opponent views require separate source control.

Source loci: De Spiritu Sancto 9.22; 27.65–67 | Oration 31.1–30

The canonical tradition of Constantinople identifies “Pneumatomachi” among the groups anathematized while affirming the Nicene faith.

Qualification: The canon’s terminology is a 381 conciliar classification and should not be projected unchanged onto earlier decades.

Source loci: Constantinople I, Canon 1

“Macedonian” and “Pneumatomachian” labels are not treated as proof of one homogeneous organization across all regions and years.

Qualification: Heresiological and polemical taxonomies require source-specific controls.

Source loci: Panarion 74, Macedonians/Pneumatomachi | Oration 31, opponent descriptions

By the early 380s, Gregory of Nazianzus directly opposed teachings associated with Apollinaris concerning Christ’s humanity and mind.

Qualification: Gregory is a theological opponent; Apollinarian propositions should be checked against surviving Apollinarian fragments before being generalized.

Source loci: Letter 101 to Cledonius, opening and anathemas | Letter 102 to Cledonius

The Constantinopolitan canonical tradition names Apollinarians among the groups rejected while maintaining Nicene faith.

Qualification: The canon proves conciliar classification, not the full diversity of Apollinarian Christologies or later reception.

Source loci: Constantinople I, Canon 1

Theodosius I’s government issued a sequence of religious constitutions that increasingly defined favored Christian confession and restricted competing practices.

Qualification: The code was compiled in AD 438; issuance and text must be distinguished from local enforcement and social effect.

Source loci: Codex Theodosianus 16.1.2–3; 16.5.6; 16.10.10–12

The AD 381 legislation names bishops such as Nectarius and Timothy as communion markers for authorized church possession.

Qualification: The constitution is evidence for imperial legal policy; it does not prove uniform ecclesial compliance.

Source loci: Codex Theodosianus 16.1.3

By AD 392 Theodosius, Arcadius and Honorius prohibited sacrifice and specified penalties in CTh 16.10.12.

Qualification: Promulgated law is not identical to universal enforcement or complete disappearance of traditional cult.

Source loci: Codex Theodosianus 16.10.12 pr.–4

CTh 16.1.2 (Cunctos populos), issued at Thessalonica on 27 February AD 380, orders imperial subjects to follow the religion associated with Damasus of Rome and Peter of Alexandria and confesses Father, Son and Holy Spirit as one divinity in equal majesty.

Qualification: The law survives in the AD 438 Theodosian Code; its wording is stronger evidence than assumptions about immediate empire-wide enforcement.

Source loci: Codex Theodosianus 16.1.2

The surviving standard carrier of Cunctos populos is the fifth-century Theodosian Code, so the AD 380 promulgation clock and AD 438 compilation clock must remain distinct.

Qualification: Carrier date does not make the underlying constitution a fifth-century enactment.

Source loci: Codex Theodosianus 16.1.2; AD 438 compilation context

Cunctos populos cannot by itself establish immediate, uniform, empire-wide enforcement or the disappearance of competing Christian groups.

Qualification: Repeated later legislation itself requires enforcement to be studied separately from promulgation.

Source loci: Codex Theodosianus 16.1.2 | Codex Theodosianus 16.5.6 and later constitutions

A council met at Constantinople in AD 381 in the Theodosian context and Gregory Nazianzen personally participated in its episcopal crisis.

Qualification: Gregory is direct for his own participation and departure; later counts and full participant lists are separately controlled.

Source loci: Oration 42.1–2, 27 | Oration 42 and related 381 material

The expanded creed conventionally called Niceno-Constantinopolitan has secure conciliar attestation in later fifth-century transmission, while its exact promulgation/recitation history at the AD 381 council remains open.

Qualification: Later secure carrier evidence supports reception and attribution, not an unqualified eyewitness claim that the extant form was drafted and promulgated in exactly that form in 381.

Source loci: Council of Chalcedon, Act II (AD 451), creed attributed to the 150 Fathers | Historia ecclesiastica 7.7, later 381 council account

The AD 381 council event, the extant creed text, its attribution to the council and later manuscript/conciliar transmission are distinct historical propositions.

Qualification: Absence of the creed from the extant canon text is a transmission control, not proof that no creed-like confession circulated in 381.

Source loci: Chalcedon, Act II — creed carrier | Constantinople I canons 1–3, which do not themselves transmit the later creed text

Constantinople Canon 1 affirms the Nicene faith and lists named groups to be anathematized.

Qualification: The canonical tradition is the evidence surface; later numbering/collection history must be kept distinct.

Source loci: Constantinople I, Canon 1

Canon 2 restricts bishops from intruding beyond their diocesan spheres, while Canon 3 grants Constantinople precedence of honor after Rome because it is New Rome.

Qualification: Honor and diocesan-administration language must not be retrojected into later fully developed jurisdictional systems.

Source loci: Constantinople I, Canons 2–3

Later canonical collections include materials associated with Constantinople beyond the first core canons, so original conciliar enactment and later collection history must be separated.

Qualification: Later collection and reception can enlarge or reorder the dossier; it is not identical with the meeting’s original documentary output.

Source loci: Latin/Greek canonical collection traditions of Constantinople | Constantinople canonical tradition; collection notes

Constantinople Canon 1 explicitly orders that the faith of the 318 fathers at Nicaea remain in force, demonstrating formal Nicene continuity in the 381 canonical tradition.

Qualification: This establishes reception of Nicaea, not the exact literary derivation of every clause in the later creed text.

Source loci: Constantinople I, Canon 1

The later Niceno-Constantinopolitan creed shares substantial Nicene material while adding/expanding clauses, but the exact compositional path between 325 and the later securely attested form is not frozen at G3.

Qualification: Literary relation and council attribution require text-history controls; similarity alone does not prove a single-step revision at 381.

Source loci: Chalcedon, Act II — Nicene and creed-of-150 comparison | De Decretis Nicaenae Synodi 19–27

Ambrose’s Letter 20 records imperial pressure in Milan to surrender a basilica and his refusal to yield it.

Qualification: Ambrose is a protagonist; his report is direct for his actions and claims but not a neutral account of every opponent motive.

Source loci: Letter 20.1–8, 19–22

In Letter 21 Ambrose argues that matters of faith and episcopal judgment should be heard by bishops rather than decided by the imperial consistory.

Qualification: This is Ambrose’s normative/legal argument in a live dispute, not proof that imperial practice everywhere followed it.

Source loci: Letter 21.1–3

Ambrose Letter 22 reports the discovery and translation of the bodies identified as Gervasius and Protasius and claims associated miracles; the discovery/translation report and miracle claims are not treated as the same evidentiary proposition.

Qualification: Ambrose is direct for his report and ritual action; miracle claims require theological/historical distinction and are not independently proven by the letter alone.

Source loci: Letter 22.1–2, 12–17

Optatus’s Contra Parmenianum attests an ongoing North African Donatist–Catholic conflict and argues against Donatist claims about the church.

Qualification: Optatus is a Catholic polemicist; his opponent descriptions require Donatist counter-witness where available.

Source loci: Contra Parmenianum 1.5–7; 2.1–7

Optatus acknowledges harsh measures by “agents of unity,” providing evidence that coercive state/church action formed part of the fourth-century Donatist conflict.

Qualification: The two sides narrate coercion adversarially; individual incidents and culpability require event-specific adjudication.

Source loci: Contra Parmenianum 3.1 | Passio Marculi / Donatist martyr dossier

Tyconius’s Liber Regularum shows a Donatist-associated exegetical intellectual tradition that cannot be reduced to the institutional polemics of Catholic anti-Donatist writers.

Qualification: Tyconius’s relation to wider Donatism is complex; his work is evidence for an intellectual current, not a universal party platform.

Source loci: Liber Regularum, Rules 1–7

Hilary, Ambrose, Jerome and the early Augustine represent distinct Latin-western theological and scholarly centers rather than one undifferentiated western school.

Qualification: The synthesis identifies multiple contemporary nodes; it does not assert complete doctrinal agreement among them.

Source loci: Hilary, De Synodis 1–4 | Ambrose, Letters 20–22 | Jerome, Gospel revision / Letter 27.1 | Augustine, Confessions 8–9

Jerome’s Roman revision activity explicitly compared divergent Latin Gospel manuscripts with Greek exemplars.

Qualification: Jerome’s claim concerns his editorial purpose and the Latin textual situation; it does not identify every manuscript he used.

Source loci: Jerome, Letter 27.1

Late-fourth-century Latin scholarship interacted with Greek theology and Scripture but retained local institutional and linguistic contexts.

Qualification: Cross-cultural intellectual contact does not imply identical terminology or direct literary dependence in each case.

Source loci: Hilary, De Synodis 1–4 | Jerome, Letter 27.1 | Augustine, Confessions 7.9–21

Athanasius’s Life of Antony depicts a growing Egyptian ascetic movement in which desert cells and monastic communities multiplied.

Qualification: The Vita is hagiographic and theological; it is direct evidence for Athanasius’s presentation and broad ascetic institutions, not a statistical census.

Source loci: Vita Antonii 14, 44, 89–94

Jerome in AD 384 distinguishes cenobitic, anchoritic and other Egyptian monastic forms and describes communal organization.

Qualification: Jerome’s typology is rhetorically evaluative and should not be universalized beyond the settings he describes.

Source loci: Jerome, Letter 22.34–36

Basil’s Asceticon witnesses regulated communal ascetic practice in Asia Minor, complementing but not collapsing into Egyptian monastic models.

Qualification: Normative rules show intended community practice; actual observance requires separate evidence.

Source loci: Longer Rules, Questions 7, 35–45

Athanasius’s Festal Letter 39 (AD 367) lists the twenty-seven books of the New Testament and distinguishes other books recommended for reading from canonical books.

Qualification: This is an Alexandrian episcopal list; it is not automatically a universal fourth-century canon decree.

Source loci: Festal Letter 39.4–7

Cyril of Jerusalem’s Catechetical Lecture 4 gives a New Testament list that does not include Revelation, showing local list variation within the fourth century.

Qualification: Cyril’s catechetical list is local evidence; omission must not be equated with universal rejection.

Source loci: Catechetical Lecture 4.33–36

Amphilochius’s canon poem reports disagreement about Revelation, explicitly noting that some accept it while many reject it.

Qualification: The poem’s own wording is evidence for diversity in reception; exact dating and manuscript transmission remain controlled.

Source loci: Iambics to Seleucus, concluding New Testament canon section

These divergent fourth-century lists preclude treating Nicaea or one fourth-century council as having demonstrably imposed a universal twenty-seven-book New Testament canon.

Qualification: The conclusion is limited to the evidence of documented list diversity and does not deny later broad convergence.

Source loci: Festal Letter 39.4–7 | Catechetical Lecture 4.33–36 | Iambics to Seleucus, canon section

Codex Sinaiticus is a major fourth-century Greek biblical manuscript witness; its palaeographic copy date is distinct from the composition dates of the works it contains.

Qualification: Palaeographic dating is a scholarly range, not a dated colophon; manuscript contents do not prove a council canon decision.

Source loci: Codex Sinaiticus, GA 01 — manuscript as a whole | Scribal Habits of Codex Sinaiticus, manuscript analysis

Codex Vaticanus (Vat. gr. 1209 / GA 03) is an early Greek biblical codex conventionally placed in the fourth century, but its production context and exact date remain open.

Qualification: The manuscript lacks an explicit dated production colophon; palaeographic dating remains a range.

Source loci: Codex Vaticanus, Vat. gr. 1209 / GA 03

Jerome states in AD 384 that Latin Gospel manuscripts varied and that he revised them toward Greek exemplars.

Qualification: This directly supports a late-fourth-century Latin textual-revision context, not a complete history of the Old Latin tradition.

Source loci: Jerome, Letter 27.1

The Gothic Bible tradition belongs to the fourth-century mission/translation horizon, but surviving Gothic manuscripts are later and therefore must not be treated as fourth-century copy witnesses.

Qualification: Translation origin and surviving manuscript dates are distinct clocks; exact original translation scope remains controlled.

Source loci: Gothic biblical translation tradition attributed to Ulfilas; surviving codices later | Early Versions of the New Testament, Gothic section

Cyril’s Catechetical Lectures attest organized pre-baptismal instruction in fourth-century Jerusalem.

Qualification: Cyril witnesses Jerusalem practice; it cannot be universalized to all churches.

Source loci: Catechetical Lectures, Procatechesis; Lectures 1–18

Late-fourth-century mystagogical and Ambrosian texts witness developed baptismal and eucharistic catechesis, but their local and textual-attribution questions remain distinct.

Qualification: Attribution and local practice must be controlled separately; liturgical resemblance does not prove identical rites everywhere.

Source loci: Mystagogical Catecheses 1–5 | De Mysteriis 1–9

Egeria describes Jerusalem’s baptismal enrollment, catechesis and Holy Week/liturgical practices as a local pilgrimage witness.

Qualification: Egeria’s account is geographically specific and should not be treated as a universal liturgical norm.

Source loci: Itinerarium Egeriae 45–47 and Holy Week sections

Ambrose’s Letter 22 records the translation of bodies identified as martyrs into a Milan basilica, linking episcopal rhetoric, relic practice and church space.

Qualification: Literary and archaeological data must be correlated without assuming every miracle or identification is independently demonstrated.

Source loci: Letter 22.1–2, 12–17 | Milan basilica archaeological dossier

Egeria’s itinerary provides direct late-fourth-century evidence for Christian pilgrimage to biblical and ecclesiastical sites and for place-based liturgical memory.

Qualification: Pilgrim interpretation and site identification are reception evidence; they do not by themselves establish first-century topography.

Source loci: Itinerarium Egeriae, Sinai/Jerusalem itineraries and 45–49

Damasan epigrams and monumental phases at Roman martyr shrines attest active late-fourth-century memorialization of martyrs in Rome.

Qualification: Epigraphy establishes commemorative practice and patronage; hagiographic details require separate source control.

Source loci: Damasan epigrams, e.g. Epigram 8 / ICUR III 8132 | Roman martyr-shrine/catacomb monumental phases

Aphrahat’s Demonstration 21 presupposes active persecution of Christians in the Persian sphere and responds apologetically to the suffering of the community.

Qualification: Aphrahat is a contemporary Syriac Christian witness; precise imperial policy and chronology require correlation with Persian and martyr sources.

Source loci: Demonstration 21.1, 21

The AD 363 Roman–Persian settlement transferred Nisibis and required population evacuation, materially changing the Christian frontier context.

Qualification: Ammianus supplies treaty narrative; Ephrem supplies Christian reception. The two are not independent accounts of every treaty clause.

Source loci: Res Gestae 25.7.9–11; 25.9.1–13 | Ephrem, Nisibene Hymns, exile/Nisibis material

Later Armenian literary narratives preserve traditions about fourth-century Christianization, but because their surviving forms are later they are not treated as independent contemporary fourth-century witnesses without corroboration.

Qualification: This is a source-competence control; archaeological/epigraphic evidence is required for independent fourth-century claims.

Source loci: Epic Histories attributed to Pʿawstos Buzand — later literary carrier | Agathangelos, History of the Armenians — later literary carrier

Post-400 church histories, canonical collections and version traditions may preserve earlier documents, but their own composition/reception clocks remain later and cannot be counted as contemporary fourth-century votes.

Qualification: Earlier-document content may be used with carrier/dependence control; later narrative synthesis remains later evidence.

Source loci: Socrates, Historia ecclesiastica, c. AD 440 | Theodoret, Historia ecclesiastica, c. AD 440s | Philostorgius fragments via later carriers