Library Eusebius of Caesarea Church History
Book 3, Chapter 21: Cerdon becomes the Third Ruler of the Church of Alexandria.
1. After Nerva had reigned a little more than a year he was succeeded by Trajan. It was during the first year of his reign that Abilius, who had ruled the church of Alexandria for thirteen years, was succeeded by Cerdon.
2. He was the third that presided over that church after Annianus, who was the first. At that time Clement still ruled the church of Rome, being also the third that held the episcopate there after Paul and Peter.
3. Linus was the first, and after him came Anencletus.
English translation by Arthur Cushman McGiffert, 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.