Library Eusebius of Caesarea Life of Constantine
Book 2, Chapter 62: Concerning the Same Arius, and the Melitians.
Some thus at Alexandria maintained an obstinate conflict on the highest questions. Others throughout Egypt and the Upper Thebaid, were at variance on account of an earlier controversy: so that the churches were everywhere distracted by divisions. The body therefore being thus diseased, the whole of Libya caught the contagion; and the rest of the remoter provinces became affected with the same disorder. For the disputants at Alexandria sent emissaries to the bishops of the several provinces, who accordingly ranged themselves as partisans on either side, and shared in the same spirit of discord.
English translation by Ernest Cushing Richardson, in Nicene and Post-Nicene Fathers, Series II, Vol. I (eds. Philip Schaff and Henry Wace; Buffalo: Christian Literature Publishing Co., 1890). Public domain. Digital text via New Advent Church Fathers.