Trapezuntine fleet under Megas doux John Kabazites was destroyed and the people of Trebizond responded to this defeat by killing any Westerner they found in the capital. Eventually, peace was reached with the Genoese, but in exchange for Kerasous they were given the fortress of Leonkastron. From now on Trebizond's commercial capacity was lessened even further, as the Genoese came to increasingly command the lucrative Black Sea trade of the port. At that time the ailing Michael was both discredited and completely unable to govern the crumbling Empire. He was deposed on December 13, 1349 by Megas doux Niketas, whom he had been forced to release from prison. Niketas and his supporters placed on the throne his nephew John, the son of Emperor Basil, who had been sent by the Byzantine Emperor John VI Kantakouzenos to Trebizond, and arrived on December 22. Upon assuming the crown, John took the name Alexios III. The deposed Emperor Michael was forced to become a monk at the cave monastery of St Sabas. In 1351, he was sent to Constantinople. Michael was released by Emperor John V Palaiologos in 1355; despite being in his sixties, he set forth Trebizond, hoping to recover his throne. Michael advanced as far as Sumela Monastery, but was prevented from entering his former capital. He returned to Constantinople, where he died. Acropolitissa Michael is known to have married the daughter of the Byzantine megas logothetes Constantine Acropolites, and Maria Komnene Tornikina, but the name of their daughter has not been recovered. For convenience, scholars have given her the name Acropolitissa, the feminine form of "Acropolites". Little is known about her; Constantine Acropolites provides most of what we directly know about her. The Emperor Andronikos II Palaiologos attempted to marry Michael Komnenos' older brother, Alexios to the daughter of one of his ministers, only to be foiled when Alexios married a princess of Georgia without telling his uncle. Nicol observes that "it would be quite in keeping with the elaborate dynastic and marital schemes of Andronikos II that, having failed to marry off the daughter of one of his ministers to the Emperor of Trebizond, he should encourage or arrange the marriage of the daughter of his Grand Logothete to that Emperor's brother." She was most likely dead by 1341, for that year Michael Megas Komnenos was invited to return to Trebizond and marry the reigning Empress, Irene Palaiologina, widow