This Battle of Adrianople occurred on April 14 1205 between Bulgarians under Tsar Kaloyan of Bulgaria, and Crusaders under the Baldwin I. It was won by the Bulgarians after a skillful ambush. Around 300 knights were killed, and Baldwin was captured, blinded, and later died in captivity. The Bulgarians then overran much of Thrace and Macedonia. Baldwin was succeeded by his younger brother, Henry of Flanders, who took the throne on August 20, 1205.

See also

• Fourth Crusade