Petros 37 was a deacon; in 787 he represented the see of Arykanda (Orykanda) in Lycia at the Second Council of Nikaia (the Seventh Ecumenical Council) and was probably present at all eight sessions, from 24 September to 23 November 787: Mansi XII 998-XIII 486. In the list of those present at the first session he is styled Πέτρου διακόνου καὶ τοποτηρητοῦ Ὀρικάνδων: Mansi XII 998. In the list of those present at the seventh session he is styled Πέτρου διακόνου καὶ ἐκ προσώπου Ὀρυκάνδων: Mansi XIII 369. Elsewhere he is styled Πέτρος διάκονος καὶ τοποτηρητὴς Υ̓ρκανῶν, Mansi XII 1106; Πέτρος διάκονος καὶ ἐκ προσώπου τοῦ θρόνου Ὀρικάνδης, Mansi XIII 148; and Πέτρος ἀνάξιος διάκονος καὶ τοποτηρητὴς τοῦ θρόνου Ὀρικάνδου, Mansi XIII 393. At the second session he supported the traditional veneration of icons as described in statements from pope Hadrian I (Hadrianos 1) and condemned iconoclasts: Mansi XII 1106. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 148. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 393. He was perhaps a deacon at the Church of Arykanda.

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