Mentioned in the decision of the ecclesiastical court of Zichna from November 1378. He was the head (κεφαλή) of the Ῥωμαίων. He attended the ecclesiastical court presided over by the Metropolitan of Zichna. The court ruled in November 1378 the conflict over the mill at Chantax in favour of the Hilandar Monastery (καὶ ἡ τῶν Ῥωμαίων ὁ Καλοϊωάννης).