The Church History of Eusebius 171Dionysius succeeds Heraclas in the Episcopate.

Eusebius of Caesarea · The Nicene and Post-Nicene Fathers Series II Volume I: Eusebius Pamphilius: Church History, Life of Constantine, Oration in Praise of Constantine by Philip Schaff

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In the third year of this emperor, Heraclas died, having held his office for sixteen years, and Dionysius received the episcopate of the churches of Alexandria.