An iconoclast, Konstantinos 139 was the bishop of Nikomedeia; probably in 762, he was one of the group of prominent iconoclasts, lay and clerical, whom the emperor Constantine V (Konstantinos 7) sent with Kallistos 8 and Kombokonon 1 to interview Stephen the Younger (Stephanos 2), then held in custody at Chrysopolis; he was then aged thirty, full of self-confidence but given to foolish behaviour; during the interview with Stephanos 2, who was on the floor, Konstantinos 139 began to kick him and had to be restrained by the senior lay members of the group: Vita Steph. Iun. 142, 7 (1140B) (Κωνσταντῖνον τὸν νεωτερίζοντα Νικομηδείας), 143, 19-21 (1141B-C) (Κωνσταντῖνος ὁ Νικομηδείας νεωτερίζων τε τῷ σώματι καὶ τῷ νοΐ καὶ σφριγῶν - ἀκμὴν γὰρ ἦγεν τριακοστόν που ἔτος τῆς ἡλικίας). He was presumably born in 732.

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