Sometime after marrying Bagrationi, John left Georgia for Caffa, where he sought to charter a large galley and its crew. By 1429 he had found one, for in that year he returned to Trebizond. Alexios IV prepared to face his son in the battlefield. John suborned some of his father's retainers, who assassinated Alexios IV while he slept. He executed the assassins of his father in order to deny any connection with them, then succeeded his father, presumably with Bagrationi as his Empress.William Miller, Trebizond: The last Greek Empire of the Byzantine Era: 1204-1461, 1926 (Chicago: Argonaut, 1969), pp. 82f
