Petros 148 was the son of Konstantinos 321 who gave him instruction in pagan and Christian literature; he was married and had a son and possibly other children; under the empress Eirene 1 he became patrikios and domestikos of the Scholai and under the emperor Nikephoros 8 he held the post of domestikos of the Hikanatoi. According to the Menologium Basilii (see below) he was appointed domestikos of the Scholai (δομέστικος τῶν σχολῶν) by the emperor Nikephoros 8; in 811 he was captured by the Bulgars in the battle when Nikephoros 8 was killed, but he had a miraculous escape, following a vision of St John the Theologos, and then became a monk; he went to live on Mt Olympus in Bithynia and joined Ioannikios 2 with whom he remained for thirty-four years (i.e. c. 812-846); following the death of Ioannikios 2 (in 846), Petros 148 went to Constantinople and there founded a church in the district of Ta Euandrou; Petros 148 lived there for a further eight years until his death (which was presumably in 854, probably on 1 July, when his feast is celebrated): Synax. Eccl. Const. 791, 35-794, 3; Menol. Bas. 517AB.

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