He had the title of kesar (caesar) and ruled over the area of Inogošt (today Surdulica), Preševo and Vranje.

Uglješa received the title of caesar when he was a boy from the Emperor Uroš the Weak,[1] and after his father's death most of his lands were usurped by the Dejanović brothers.

Over the years, Vlatković was a faithful vassal of Stefan Lazarević and with his forces participated in the Battle of Kosmidion on 15 June 1410.

Byzantine sources mentioned him as part of Lazarević's delegation which went to Constantinople at the Emperor Manuel II's invitation.

Çelebi's forces marched across the Čemernik, sacked Vranje and attacked Novo Brdo, and Vlatković himself barely managed to stay alive.