Forces from this country lost the Battle of Maritsa despite overwhelming odds.
Forces from this country lost the Battle of Maritsa despite overwhelming odds. One treaty signed in this country was the Treaty of Karlowitz. One partisan from this country assassinated Murad I at a battle that took place on the Field of Blackbirds. Despite losing their king Stefan Lazar, this country won the Battle of (*) Kosovo. More recently, this country split with Montenegro. For 10 points, name this Balkan nation that has its capital at Belgrade.
Forces from this country lost the Battle of Maritsa despite overwhelming odds.
{Serbia}