Eusebius Book 3, Section 2

3.2.1

ΙΙ. Τῆς δὲ Ῥωμαίων ἐκκλησίας μετὰ τὴν Παύλου καὶ Πέτρου μαρτυρίαν πρῶτος κληροῦται τὴν ἐπισκοπὴν Λίνος. μνημονεύει τούτου Τιμοθέῳ γράφων ἀπὸ Ῥώμης ὁ Παῦλος κατὰ τὴν ἐπὶ τέλει τῆς ἐπιστολῆς πρόσρησιν.

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II. After the martyrdom of Paul and Peter, Linus was the first appointed to the bishopric of the church of Rome. Paul mentions him when writing from Rome to Timothy in the salutation at the end of the Epistle.