Kaloyan of Bulgaria
The Battle of Adrianople occurred around Adrianople on April 14, 1205 between Bulgarians, Vlachs and Cumans under Tsar Kaloyan of Bulgaria, and Crusaders under Baldwin I, who only months before had been crowned Emperor of Constantinople, allied with Venetians under Doge Enrico Dandolo. It was won by the Bulgarians, Vlachs and Cumans after a successful ambush.