Michael 25 was a monk of the monastery of the Hagia Theotokos of the Pyrgos; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) as representative of the hegoumenos of the monastery (whose name is not recorded); he is attested at the fourth session, on 1 October 787, when he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 156 (Μιχαὴλ μοναχὸς, καὶ ἐκ προσώπου τοῦ ἡγουμένου μονῆς ἁγίας Θεοτόκου τοῦ Πύργου; the Latin version, at 155, calls him "Michael monachus, et ex persona hegumeni monasterii sanctae Dei genitricis Pyrgi"). He probably attended other sessions of the Council also; see Gregorios 45.

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