"After the fall of Constantinople in 1453, Ottoman sultan Mehmed II was rallying his resources in order to subjugate the Kingdom of Hungary. His immediate objective was the border fort (Hungarian végvár) of the town of Belgrade (in old Hungarian Nándorfehérvár). John Hunyadi, a nobleman and warlord of Vlach lineage, who fought many battles against the Ottomans in the previous two decades, expected just such an attack…."more here!:
