On 27 August 1388, Grand Duke Vlatko defeated an Ottoman raiding party (probably up to 18,000 strong) in the Battle of Bileća.
[2] Bosnian heavy cavalry is typically credited with winning the battle as they broke the Ottoman ranks and pursued the retreating enemy.
[3][4][5] In 1389, dispatched by his king Tvrtko I, he commanded a Bosnian army contingent as part of a Christian coalition that fought alongside Serbian prince Lazar Hrebeljanović at the Battle of Kosovo against the Ottomans.
It was thought that both Vlatko's and his wife's graves lie marked in a stećak necropolis near the village of Boljuni, not far from Stolac, in Bosnia and Herzegovina.
Written in Bosnian Cyrillic, the inscription on that particular grave says: "Ase leži dobri junak i čovjek Vlatko Vuković" (lit.