Petros 75 was the mystographos of the patriarch Photios 1 during Photios 1's second period as patriarch (after 877); he stole the seals of all the metropolitan bishops, so that the letter which Photios 1 sent to the bishop of Rome, John VIII (Ioannes 243), explaining his return to office, could appear to have their authority; for this Petros 75 was later made bishop of Sardis: Nicetas, Vita Ignatii 572D (διὰ τοῦ μυστογράφου Πέτρου, ὃς καὶ τὰς Σάρδεις ὕστερον ἔπαθλον τῶν πλασμάτων ἠνέγκατο). He was probably mystographos of Photios 1 in 877/878, since the letter to the pope (Ioannes 243) was delivered by his new apokrisiarios Theodoros (of Patrai) (PBE II). He may be identical with Petros, metropolitan bishop of Sardis, who owned a seal dateable to the second half of the ninth century: Zacos II 869. Obv.: bust of St Peter; circular inscription +Ἅγιε Πέτρ..... Rev.: +Πετρω - μητροπο - λιτη Σαρ - δεων. Cf. also Petros 74. Possibly identical with the metropolitan bishop of Sardis, Petros (PBE II), who was one of the bishops deposed by the patriarch Nikolaos Mystikos (PBE II) in 912: see Vita Euthymii (de Boor; BHG 651) XVIII 7, p. 62, 17; Vita Euthymii (Karlin-Hayter; BHG 651) XVIII 117, 1-3.

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