The name of Petros 28, missing from the Greek MSS of Theophanes, is restored from Anastasius Bibliothecarius. He was hegoumenos of the monastery of St Saba at Rome in 785, when he was sent with Petros 27 to Constantinople by pope Hadrian I (Hadrianos 1) after a request from the empress Eirene 1 for papal representatives to attend the forthcoming Council on iconoclasm; they are described as honourable men of excellent character (ἄνδρας τιμίους καὶ πάσῃ ἀρετῇ κεκοσμημένους): Theoph. AM 6277 (τὸν ἡγούμενον τοῦ ἁγίου Σάβα). Since the letter which they took from pope Hadrianos 1 to the emperors was dated 26 October 785 (Mansi XII 1076), their journey began late in that year. They also took the letter from Hadrianos 1 to the patriarch Tarasios 1 in response to the latter's synodikon: Mansi XII 1083. They travelled with the bishop of Katana, Theodoros 70, other bishops from Sicily, and the deacon Epiphanios 3: Mansi XII 1078. Abbot (abbas) of the monastery of St Saba at Rome ("Petrum religiosum abbatem venerabilis monasterii sancti Sabae qui appellatur Cella Nova"); he was sent with Petros 27 to Constantinople as legates of pope Hadrianos 1 to Constantine VI (Konstantinos 8) and Eirene 1 in connection with the matter of the veneration of icons; after the Council (of Nikaia) they returned to Rome with copies of the decrees of the Council and of the emperor's commands: Lib. Pont. 97. 88. They arrived in time to attend the Council in the Church of the Holy Apostles on 7 August 786 (so Theophanes; the correct date was 31 July, see Grumel, Regestes, 355): Theoph. AM 6278. They remained in Constantinople until the Council was reconvened in October (in fact, September) 787 at Nikaia: Theoph. AM 6279. Priest, monk and hegoumenos of the monastery of St Saba at Rome (Πέτρου τοῦ εὐλαβεστάτου πρεσβυτέρου μοναχοῦ καὶ ἡγουμένου τῆς κατὰ τὴν Ῥώμην εὐαγοῦς μονῆς τοῦ ἁγίου Σάββα or similar); in 787 he attended the Second Council of Nikaia as one of the two representatives of pope Hadrianos 1 (the junior one, see Petros 27); he was present at the first seven sessions and presumably attended all eight, from 24 September to 23 November: Mansi XII 994, 1051, 1114, XIII 1, 157, 204, 365, cf. Ignatius, Vita Tarasii 28 (monk and hegoumenos; Petros 28 and Petros 27 represented pope Hadrian I (Hadrianos 1) at the Council), Photius, Ep. 1, lines 371-372 (I 13 Laourdas-Westerink) (Πέτρον ἄλλον, πρεσβύτερον καὶ αὐτὸν καὶ τῆς ἐκεῖσε μονῆς ἡγούμενον τοῦ ἁγίου Σάβα), Ep. 2, lines 364-365 (I 52 Laourdas-Westerink) (πρεσβύτερος, μοναχὸς καὶ ἡγούμενος τῆς κατὰ Ῥωμὴν εὐαγοῦς μονῆς τοῦ ἁγίου Σάβα) (with Petros 27 he represented pope Hadrianos 1 at the Council). They brought letters to the emperors and Tarasios 1 from pope Hadrianos 1: Mansi XII 1007, 1075, 1083, 1086, 1127, XIII 459 (and see above). At the second session they asked if the Council accepted the faith and the traditional veneration of icons as described by Hadrianos 1: Mansi XII 1075, 1083- 1086. At the third session he accepted the orthodoxy of a letter from the eastern patriarchs: Mansi XII 1146. At the fourth session Petros 28 subscribed the statements read out from the Fathers in support of icon veneration: Mansi XIII 133. At the fifth session Petros 28 and Petros 27 noted that the views expressed by Eusebius of Caesarea were heretical and Arian: Mansi XIII 177. At the end of the fifth session a statement from Petros 28 and Petros 27 was read out by Petros 27 to Tarasios 1 and the Council asking that a holy icon be brought into their midst and that the writings of the iconoclasts be either anathematised or burned: Mansi XIII 200 (Πέτρος πρεσβύτερος καὶ ἡγούμενος τῆς μονῆς τοῦ ἁγίου Σάββα). At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 380 (Πέτρος ἀνάξιος πρεσβύτερος καὶ ἡγούμενος τοῦ ἁγίου πατρὸς ἡμῶν Σάββα, καὶ τὸν τόπον ἀναπληρῶν Ἀδριανοῦ πάπα τῆς πρεσβυτέρας Ῥώμης). Petros 28 and Petros 27 were the unnamed persons recorded as communicating with the newly made patriarch Tarasios 1, in Theod. Stud., Ep. 53, pp. 155- 159. Theodoros 15 also claims in another letter that they went to Constantinople on other business and had no authority to attend the Council and so were deposed after their return to Rome: Theod. Stud., Ep. 38, pp. 108-111.

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