Mezue ahịrịokwu na-esonụ: Stefan Lazarević sonyere dị ka Ottoman vasal na Agha Karanovasa na 1394, Agha nke Rovine na 1395, Agha nke Nicopolis na 1396, na na
Agha Angora na 1402. Mgbe Angora gachara, ọ gara Constantinople, isi obodo nke Alaeze Ukwu Byzantine, ebe e nyere ya aha Despot, kemgbe ahụ, a maara steeti ya dị ka Serbian Despotate na 1402.