The Bishops of Rome and of Alexandria during the Reign of Trajan
1 About the twelfth year of the reign of Trajan the above-mentioned bishop of the parish of Alexandria died, and Primus, the fourth in succession from the apostles, was chosen to the office.
2. At that time also Alexander, the fifth in the line of succession from Peter and Paul, received the episcopate at Rome, after Evarestus had held the office eight years.
Source: Church History (New Advent)