From Bursa Stefan and his brother Vuk Lazarević came to Constantinople, which was released after several years of Ottoman blockade. John VII Palaiologos (who ruled in place of his absent uncle Emperor Manuel II Palaiologos) awarded Prince Stefan in August 1402 the high Byzantine title of Despot, which in Byzantine hierarchy was just beneath the Imperial. In addition, the marriage of Stefan and Helen Gattilusio, the daughter of Florentine master of Lesbos Francesco II Gattilusio was contracted. These events are evidence of Stefan's new commitment as vassal to King Sigismund.