There is one account, early in his reign, that is in contrast to his general record of incompetence. In 1356, Matthew Kantakouzenos, a pretender to the Byzantine throne, gathered an army of 5,000 Turks and marched on Serres, the Serbian-held capital of Jovan Uglješa. Uroš V, whose mother ruled from Serres, decided to raise an army to defend his mother. In 1357, when Matthew and his Turks attacked, the Serbian army under Vojihna of Drama (a major player in that region) came to aid. The Turks were defeated. Matthew Kantakouzenos was captured and held hostage until his ransom was paid by the Byzantine Emperor John V Palaiologos.