Original: Eusebius of Caesarea counted 220, Athanasius of Alexandria counted 318, Ad Afros Epistola Synodica 2 and Eustathius of Antioch counted 270Theodoret H.E. 1.7 (all three were present at the council).
Simplified: Eusebius of Caesarea counted 250, Athanasius of Alexandria counted 318, Ad Afros Epistola Synodica 2 and Eustathius of Antioch counted 270Theodoret H.E. 1.7 (all three were present at the council).