Za realistu i ostalu g.a.m.a.d. poznatu pod skupnim nazivom S.m.r.d.l.j.e. - ...\'\'The Ottoman force also included 1,500 Serbian heavy cavalry knights under the command of Prince Stefan Lazarević, who was Sultan Bayezid\'s vassal since the Battle of Kosovo in 1389, as well as his brother-in-law after the Sultan married Stefan\'s sister, Princess Olivera Despina, the daughter of Prince Lazar of Serbia (Stefan\'s father) who had perished at Kosovo.\'\'