Mentioned in the Chronicle of Ioannina under the year 1379. He appears as ἔντιμος in the chronicle. He was an ἄρχων in Kastoria, 1379. He probably worked as an author (?). He came along with Chontetzes in 1379 to request Toma Preljubović (Θωμᾶς Πρέλουμπος) to take in possession the town of Serbia. Toma Preljubović imprisoned him in order to demand ransom for him (Τὸν αὐτὸν ἤδη χρόνον, Κυριακῇ πρὸ τῆς Χριστοῦ γεννήσεως, προσῆλθον αὐτῷ ἀπὸ τὰ μέρη τῆς Καστορίας τῶν ἐντίμων ἀρχόντων ὁ θεωρίᾳ καὶ πράξει χαριτώνυμος Θεοφύλακτος, καὶ μετ’ αὐτοῦ ὁ Χοντέτζης λεγόμενος· έζήτουν δὲ αὐτὸν αὐθέντην καὶ ἡγεμόνα τοῦ κάστρου Σερβίων. Αὐτὸς δέ, κυριευόμενος ὑπὸ τῆς φιλαργυρίας, ἐν τῇ φρουρᾷ αὐτοὺς). Ioannes Theophylaktos is likely an author of a canon on the Saint Arsenios from Kerkyra.