Event · AD 343 · Serdica (Sofia), Dacia · Philippopolis

The Council of Serdica, AD 343

The Council of Serdica reaffirms Nicaea in the West

**A council called to end the Arian dispute, which ended as two councils, each claiming the name.**

Constans and Constantius summoned it at the urging of **Julius of Rome**, and it met at Serdica — modern Sofia — because the city stood near the line between the two emperors’ halves. **Hosius of Cordova presided**, as he had at Nicaea eighteen years earlier; Julius sent two presbyters and a deacon rather than come himself.

**It broke on the first question: who was allowed in the room.** The West required that **Athanasius**, **Marcellus of Ancyra** and Asclepas of Gaza — all deposed by eastern councils — sit as bishops. The East refused to sit with men another council had condemned, withdrew to **Philippopolis**, excommunicated Julius and Hosius, and issued a creed of its own. The West then acquitted the three, deposed the eastern leaders, and passed the canons.

## The canons outlast the failure

**Canon 3 puts an appellate role for Rome in writing for the first time**, and its language is the substance: *“let us, if it seem good to your charity, honour the memory of Peter the Apostle, and let those who gave judgment write to Julius, the bishop of Rome”* — a named pope, in a canon, deciding whether a deposed bishop’s case is retried. **Canon 1 is in Hosius’s own voice** and forbids a bishop to move from a small city to a larger one, with the dry reason that no bishop was ever found who attempted the reverse.

**⚠ The appeal canons are disputed both textually and legally.** The Greek and Latin transmissions differ, and whether the canon creates a second or a third appeal has been argued for four centuries — Van Espen and the Ballerini on one side; De Marca, Tillemont and Hefele on the other. Because Julius is named personally, some have held the grant temporary by design. **The archive records the dispute, not a reading of it.**

## What cannot be settled: how many, and when

**Athanasius gives two different numbers in two works this library holds.** In the *Apology Against the Arians* he counts about **340** — those present, plus those who subscribed afterwards, plus those who had written for him from Phrygia, Asia and Isauria. In the *History of the Arians* 15 he gives about **170** as the number who actually met at Serdica. Socrates reports about **300** from the western parts and cites Sabinus of Heraclea against his own figures. **These do not reconcile, and the record prints them side by side.**

**The date divides the same way.** Socrates dates the synod by the consulship of Rufinus and Eusebius, which is **347**; Hefele and modern opinion place it in the autumn of **343**, running into 344, which is why the canons are still headed “343 or 344”. One physical witness favours 343: the eastern bishops’ creed survives in a seventh- or eighth-century Latin manuscript with a **paschal table appended**, listing 14 Nisan for the years 328 to 343 — the last year in the list being, on the natural reading, the year of the document.

## Why the West kept the record and the East did not

The Serdican dossier survives because **Athanasius printed it in his own defence**, and the eastern encyclical survives because **Hilary of Poitiers copied it into a collection against the Arians**. Both preservers were parties to the quarrel. ⚠ The archive states that plainly: **every document from this council reaches us through a man with an interest in it** — and the Latin charge that the easterners “falsely dated” their creed from Serdica is one of those parties’ judgement, not a neutral finding.

The sources for this event

Every source the record rests on, with what it says and what it cannot carry.

Athanasius, Apology Against the Arians 36–50

c. AD 349

Apology Against the Arians 36–50 (esp. 50)

[Athanasius reproduces the Serdican dossier — the synodal letter of the western bishops, the letter to the church of Alexandria, and the subscriptions — because it acquitted him. **At ch. 50 he counts about 340 names**: those who met, those who subscribed afterwards, and those who had written in his favour from Phrygia, Asia and Isauria. **The reckoning is cumulative, which is why it does not agree with his own figure elsewhere**, and the archive keeps both rather than choosing.]

*The Apology Against the Arians* — held in this library. English: M. Atkinson and A. Robertson, NPNF 2nd ser. 4 (1892), public domain. ⚠ Athanasius is the defendant printing his own acquittal: the documents are genuine, the selection is his.

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Athanasius, History of the Arians 15

c. AD 357

History of the Arians (Letter to the Monks) 15

[Here the same author gives **about 170 bishops as those who met at Serdica** — roughly half his own cumulative total in the *Apology*. **The archive’s find is the discrepancy, and that both terms of it are on its own shelves**: one work counting everyone who ever endorsed the verdict, the other counting the men in the room. Neither figure matches the surviving western subscription list, which is shorter again.]

*The History of the Arians* — held in this library, written in hiding AD 357–358. English: NPNF 2nd ser. 4, public domain. ⚠ A polemical narrative for a sympathetic readership, not a register.

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The canons of Serdica

c. AD 343

Canons 1 and 3 (Latin and Greek recensions)

**Canon 3:** “But if perchance sentence be given against a bishop in any matter and he supposes his case to be not unsound but good, in order that the question may be reopened, let us, if it seem good to your charity, honour the memory of Peter the Apostle, and let those who gave judgment write to Julius, the bishop of Rome, so that, if necessary, the case may be retried by the bishops of the neighbouring provinces and let him appoint arbiters.” **Canon 1, Hosius speaking:** “A prevalent evil, or rather most mischievous corruption must be done away with from its very foundations. Let no bishop be allowed to remove from a small city to a different one… since no bishop could ever yet be found who endeavoured to be translated from a larger city to a smaller one.” [⚠ The recensions differ, and the renderings with them: one line of transmission has the judges write to Julius who may order a retrial and *appoint judges*, another has the neighbouring provinces retry with *arbiters*. Whether this is a second appeal or a third has been argued since the seventeenth century. **The variant is recorded rather than smoothed.**]

Not held as a text record in this library. Latin and Greek in the conciliar collections (Prisca, Dionysius Exiguus, Isidore; Greek in John of Constantinople’s sixth-century collection); public-domain English: H. R. Percival, NPNF 2nd ser. 14 (1900).

Socrates Scholasticus, Ecclesiastical History II.20

c. AD 439

Ecclesiastical History II.20

[Socrates has the council summoned by the joint authority of the two emperors, gives **about 300 bishops from the western parts**, and dates the synod by **the consulship of Rufinus and Eusebius** — which is AD 347, not the received 343. He also cites **Sabinus of Heraclea**, the Macedonian collector of synodal acts, whose figures he elsewhere distrusts. ⚠ **The disagreement is in the ancient sources, not in the modern reading of them**: a historian working from documents in the fifth century could not fix the year of a council a century old.]

Socrates, *Ecclesiastical History* — held in this library. English: A. C. Zenos, NPNF 2nd ser. 2 (1890), public domain.

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The eastern bishops at Philippopolis — creed, anathemas and encyclical

c. AD 343

The Philippopolis encyclical and creed; the Sardica paschal table

[The seceders state their ground — that one council may not revise another’s sentence — excommunicate Julius of Rome, Hosius and the western leaders, and publish a creed **which they issue in Serdica’s name.** ⚠ The western sources call that dating false; the archive records the charge as a party’s judgement. **The manuscript that carries the creed also carries the archive’s best dating evidence**: a paschal table of 14 Nisan dates running to 343.]

**Not held in this library.** Latin fragments in Hilary of Poitiers, *Collectanea antiariana Parisina* (CSEL 65, ed. A. Feder, 1916); the eastern creed also survives in a seventh- or eighth-century Latin manuscript with a paschal table appended. No public-domain English of the fragments is known to the archive.

Figures in this event (8)

Scholarship

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