See William’s book, Arius: Heresy and Tradition pp. 58-9; 67-81.

William’s most notable deviation from Opitz’s chronology is that he reverses the order of Alexander’s two longer letters (Henos sōmatos/urk. 4b/doc. 2.2 and Hē philarchos/urk. 14/doc. 17). He also shortens the span of time from the outbreak of the controversy to the Council of Nicaea, allowing for about 4 years instead of 6. We end the chart at 325, after which Williams seems to follow Opitz’s chronology. We have only included dates mentioned in Arius, or dates that seem to fit with the other dates he gives. Fragments have been excluded.

Chart:
W- date: The date Williams assigns to the document, if listed in Arius:
Heresy and Tradition
ancient source: gives the location in the sources from which we have taken the document.
translations: gives the location of translations. FCC translations may be accessed by clicking the link
doc the document number in the 2007 edition of Athanasius Werke
2007 date the approximate date of in the 2007 edition of Athanasius Werke
urk.: provides the document number (Urk.) in Opitz’s Early Arian Documents (German: Urkunden).  See the contents of this volume by page number
Opitz date the date assigned by Opitz. Click here to see the issues related to chronology.
CPG: Clavis Patrum Graecorum reference number.
extra space
W-date description ancient sources translations doc. 2007 date urk. Opitz date CPG
321 Arius and his followers to Alexander of Alexandria Athanasius, De synodis 16;
Epiphanius, Panarion 69.7;
Hilary, De Trinitate 4.12		 FCC;
CLA no. 22;
Hanson, pp. 7-8; NPNF2 vol. 4, p. 458; NPNF2 vol. 9, p. 74;
New Eusebius, no. 284		 1 318-320 6 c. 320 2026
321 Summary of letter of a council in Palestine reinstating Arius Sozomen, Historia ecclesiastica 1.15.11 FCC; NPNF2 vol. 2, p. 252 8 320-322 10 c. 321/2 –
321/2 Alexander of Alexandria to Alexander of Byzantium Theodoret, Historia ecclesiastica 1.4
(1.3 in the NPNF)		 FCC;
CLA no. 21; NPNF2 vol. 3, pp. 35-41;
Discussed in Hanson, p. 141-2
Discussed on New Eusebius, no. 285		 17 323-324 14 324 2002
321/2 Arius to Eusebius of Nicomedia Epiphanius, Panarion 69.6;
Theodoret, Historia ecclesiastica 1.5
(1.4 in the NPNF)
FCC;
New Eusebius, no. 283;
Sections 2-8: Hanson, p. 139,
Sections 4-5: Hanson, p. 6; NPNF2 vol. 3, p. 41		 15 323-324 1 c. 318 2025
321/2 Fragment of a letter from Eusebius of Nicomedia to Arius Athanasius, De synodis 17.2 FCC;
Hanson, p. 31; NPNF2 vol. 4, p. 459		 16 323-324 2 c. 318 2046
321-323 Eusebius of Caesarea to Euphration of Balanea Sections 1-3: Council of Nicaea, Session 5: Labbe vol. 7, col. 365; Sections 1-2: 2nd Council of Nicaea, Session 5: in Mansi vol. 13, col.176, 317;
Sections 4-5: Eusebius, Contra Marcellum1.4.40-41, 57; Athanasius,De synodis 17.3		 FCC 10 320-322 3 c. 318 3500
321-323 Athanasius of Anazarbus to Alexander of Alexandria Athanasius, De synodis 17.4 FCC; NPNF2 vol. 4, p. 458;
Discussed Hanson, p. 42		 11 320-322 11 c. 322 2060
321-323 Priest George to Alexander of Alexandria Athanasius, De synodis 17.5 FCC;
Hanson, p. 44; NPNF2 vol. 4, p. 459		 6 318-320 12 c. 322 3555
321-323 Priest George to the Arians in Alexandria Athanasius, De synodis 17.6 FCC;
Hanson, p. 44; NPNF2 vol. 4, p. 459		 7 318-320 13 c. 322 3556
323 Fragment of a letter of Alexander of Alexandria to all bishops Greek: Schwartz, pp. 265-7;
Syriac: Pitra, vol. 4, pp. 196-7		 FCC 14 320-322 15 324 2003
323 Eusebius of Nicomedia to Paulinus of Tyre Theodoret, Historia ecclesiastica 1.6
(1.5 in the NPNF)		 FCC; NPNF2 vol. 3, p. 42 4 318-320 8 c. 320 2045
324 Summary of letter of a Council in Bithynia Sozomen, Historia ecclesiastica 1.15.10 FCC; NPNF2 vol. 2, p. 252 3 318-320 5 c. 320 –
324Dec. Emperor Constantine to Alexander of Alexandria and Arius Eusebius, Vita Constantini, 2.64;
Sections 6-15: Socrates, Historia ecclesiastica 1.7;
Sections 6-15: Anonymous Church History 2.4		 FCC;
New Eusebius, no. 287; Coleman, no. 47;
NPNF2 vol. 1, pp. 515-8;
Sections 6-15: NPNF2 vol. 2, p. 6-7		 19 323-324 17 324Oct 2020
325Jan./Feb. Alexander of Alexandria to his clergy Athanasius, De decretis 34 FCC; NPNF2 vol. 4, p. 69 2.1 318-320 4a 318/9 2001
325early Alexander of Alexandria’s encyclical letter on Arius‘s deposition Athanasius, De decretis 35;
Socrates, Historia ecclesiastica 1.6.;
Anonymous Church History 2.3.1-21		 FCC;
New Eusebius, no. NPNF2 vol. 4, pp. 69-72; NPNF2 vol. 2, pp.3-5;
282;Sections 2-3: Hanson, p. 16		 2.2 318-320 4b c. 318 2000
325 Eusebius of Caesarea to Alexander of Alexandria 2nd Council of Nicaea:
Labbe, vol. 7, col. 496 and Mansi, vol.13, coll. 316-7		 FCC 9 320-322 7 c. 320 3501
325early Letter of the Council of Antioch (325) Greek and Syriac: Schwartz, pp. 271-9;
Syriac: Schulthess, pp. 160-2		 FCC;
New Eusebius, no. 288;
Sections 8-11: Hanson, p. 149		 20 325 18 325early 8509

Click to see Documents of the Early Arian Controversy
Documents of the Early Arian Controversy according to Sarah Parvis (2006)
Documents of the Early Arian Controversy according to Athanasius Werke – Urkunden vol. 3.3 (2007)

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