Nicene and Post-Nicene Fathers, Ser. II, Vol I:
The Church History of Eusebius.: Chapter XXXV

Chapter XXXV.—Dionysius succeeds Heraclas in the Episcopate.

In the third year of this emperor, Heraclas 2043 died, having held his office for sixteen years, and Dionysius 2044 received the episcopate of the churches of Alexandria.

Footnotes

On Heraclas, see chap. 3, note 2. The third year of Philip’s reign extended from the summer of 246 to the summer of 247, so that if Heraclas became bishop in 232, he cannot have held office fully sixteen years. The agreement, however, is so close as to occasion no difficulty.

On Dionysius, see chap. 40, note 1.