April 14, 1205Battle of Adrianople between Bulgarians and Crusaders.
The Battle of Adrianople occurred on April 14, 1205 between Bulgarians under Tsar Kaloyan of Bulgaria, and Crusaders under Baldwin I. It was won by the Bulgarians after a skillful ambush using the help of their Cuman and Greek allies. Around 300 knights were killed, including Louis of Blois, Duke of Nicaea and Baldwin was captured 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, 1206.