After Antoninus had been emperor for nineteen years, Commodus received the government. In his first year Julian became bishop of the Alexandrian churches, after Agrippinus had held the office for twelve years.
Historia Ecclesiastica
Book V, Chapter 9. The Bishops under Commodus
1 section
Eusebius of Caesarea
Trans. Arthur Cushman McGiffert, A Select Library of Nicene and Post-Nicene Fathers of the Christian Church, Second Series, Volume I, 1890. Public domain.