Eusebius Book 6, Section 35

6.35.1

XXXV. τρίτον δὲ τούτῳ ἔτος ἦν, καθ’ ὃ μεταλλάξαντος Ἡρακλᾶ τὸν βίον ἐπὶ δέκα ἓξ ἔτεσιν τῆς προστασίας τῶν κατ’ Ἀλεξάνδρειαν ἐκκΛησιῶν, τὴν ἐπισκοπὴν Διονύσιος ὑπολαμβάνει.

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XXXV. It was the third year of his reign when Heraclas departed this life, after presiding for sixteen years over the churches at Alexandria; Dionysius took up the episcopal office.