Sigismund, Holy Roman Emperor led Bulgarians.
In 1396, Sigismund led the Crusade of Nicopolis, but was decisively defeated by the Ottoman Empire
 In 1403, Hungarian possessions in northwestern regions of Serbia (city of Belgrade and the Banate of Macs), were given to despot Stefan, who pledged his allegiance to king Sigismund, remaining the king's loyal vassal until death in 1427

