Konstantinos 74 was bishop of Ankyra in Phrygia Pacatiana; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) and is attested at the fourth and seventh sessions, on 1 October and 13 October 787: Mansi XIII 149 (Κωνσταντῖνος ἐπίσκοπος Ἀγκύρας), 397 (Κώνστανς ἀνάξιος ἐπίσκοπος Ἀγκύρας). At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 149. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 397. He is named in a group of bishops from Phrygia Pacatiana and his see, which had been united with Synaos in 680-681, had again become separate; see Stephanos 42.

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