Polychronios 1 was the bishop of Theopolis, also called Prousa, in Bithynia; in 681 he attended the Third Council of Constantinople (the Sixth Ecumenical Council) and was present at two of the last three sessions (sessions sixteen and eighteen, on 9 August and 16 September): Riedinger II 2. 690-826 (= Mansi XI 616-676). At the time he was an old man and the statement of the faith, which condemned monotheletism, and the Acts of the Council were both signed on his behalf by one of the priests of his church, Theodosios 8: Riedinger II 2. 796, lines 2-4, 797, lines 2-4 (= Mansi XI 653, 654) ("propter senectutem meam"), Mansi XI 675 ("propter senectutem suam"), Riedinger II 2. 826, lines 32-33 (= Mansi XI 676) (διὰ τὸ προσὸν αὐτῷ γῆρας). In the subscriptions to the statement of the faith he is styled Πολυχρόνιος ἐλέει Θεοῦ ἐπίσκοπος τῆς Θεουπολιτῶν πόλεως τῆς Βιθυνῶν ἐπαρχίας: Riedinger II 2. 796, lines 2-4 (= Mansi XI 653). The old Latin version here calls his see "Theupolitane ciuitatis Bithiniae regionis": Riedinger II 2. 797, lines 2-4 (= Mansi XI 654). In the signatures to the Council he is styled Πολυχρόνιος ἐλέει Θεοῦ ἐπίσκοπος Θεουπόλεως ἤτοι Προύσης: Riedinger II 2. 826, lines 33-34 (= Mansi XI 676). The old Latin version here calls his see "Theopoleos sive Prusae": Mansi XI 675. In the lists of those attending each session he is styled Πολυχρονίου ἐπισκόπου Θεουπόλεως ἤτοι Προύσης: Riedinger II 2. 690, line 9, 760, line 20 (= Mansi XI 616, 628).

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