Attendees
Constantine had invited all 1800 bishops of the Christian church (about 1000 in the east and 800 in the west), but a smaller and unknown number attended. Eusebius of Caesarea counted 220, Athanasius of Alexandria counted 318, and Eustathius of Antioch counted 270 (all three were present at the council). Later, Socrates Scholasticus recorded more than 300, and Evagrius, Hilary of Poitiers, Jerome and Rufinus recorded 318. Delegates came from every region of the Roman Empire except Britain. In Ethiopic Christian literature including both the Fetha Negest and the Kibre Negest, the First Council of Nicea (Niqya) is traditionally referred to as "the three hundred and eighteen Orthodox Fathers".
The participating bishops were given free travel to and from their episcopal sees to the council, as well as lodging. These bishops did not travel alone; each one had permission to bring with him two priests and three deacons; so the total number of attendees could have been above 1800. Eusebius speaks of an almost innumerable host of accompanying priests, deacons and acolytes.
A special prominence was also attached to this council because the persecution of Christians had just ended with the Edict of Milan, issued in February of AD 313 by Emperors Constantine and Licinius.
The Eastern bishops formed the great majority. Of these, the first rank was held by the three patriarchs: Alexander of Alexandria, Eustathius of Antioch, and Macarius of Jerusalem. Many of the assembled fathers—for instance, Paphnutius of Thebes, Potamon of Heraclea and Paul of Neocaesarea—had stood forth as confessors of the faith and came to the council with the marks of persecution on their faces. This position is supported by patristic scholar Timothy Barnes in his book Constantine and Eusebius. Historically, the influence of these marred confessors has been seen as substantial, but recent scholarship has called this into question.
Other remarkable attendees were Eusebius of Nicomedia; Eusebius of Caesarea, the purported first church historian; legends attest and circumstances suggest that Nicholas of Myra attended (his life was the seed of the Santa Claus legends) but none of the ancient rolls include him; Aristakes of Armenia (son of Saint Gregory the Illuminator); Leontius of Caesarea; Jacob of Nisibis, a former hermit; Hypatius of Gangra; Protogenes of Sardica; Melitius of Sebastopolis; Achilleus of Larissa (considered the Athanasius of Thessaly) and Spyridion of Trimythous, who even while a bishop made his living as a shepherd. From foreign places came John, bishop of Persia and India, Theophilus, a Gothic bishop and Stratophilus, bishop of Pitiunt of Georgia.
The Latin-speaking provinces sent at least five representatives: Marcus of Calabria from Italia, Cecilian of Carthage from Africa, Hosius of Córdoba from Hispania, Nicasius of Dijon from Gaul, and Domnus of Stridon from the province of the Danube.
Athanasius of Alexandria, a young deacon and companion of Bishop Alexander of Alexandria, was among the assistants. Athanasius eventually spent most of his life battling against Arianism. Alexander of Constantinople, then a presbyter, was also present as representative of his aged bishop.
The supporters of Arius included Secundus of Ptolemais, Theonus of Marmarica, Zphyrius, and Dathes, all of whom hailed from the Libyan Pentapolis. Other supporters included Eusebius of Nicomedia, Eusebius of Caesarea, Paulinus of Tyrus, Actius of Lydda, Menophantus of Ephesus, and Theognus of Nicea.
"Resplendent in purple and gold, Constantine made a ceremonial entrance at the opening of the council, probably in early June, but respectfully seated the bishops ahead of himself." As Eusebius described, Constantine "himself proceeded through the midst of the assembly, like some heavenly messenger of God, clothed in raiment which glittered as it were with rays of light, reflecting the glowing radiance of a purple robe, and adorned with the brilliant splendor of gold and precious stones." He was present as an observer, and did not vote. Constantine organized the Council along the lines of the Roman Senate. Hosius of Cordoba may have presided over its deliberations; he was probably one of the Papal legates. Eusebius of Nicomedia probably gave the welcoming address.
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