By the end of 1204, the Latins had captured Thrace, Thessaly and northern Greece. Emperor AlexiosIII's cousin, Michael Doukas, who organised the Greeks' resistance in Epirus, was forced to swear fealty to Pope Innocent III to secure his protection. Emperor Baldwin dispatched his brother, Henry, to conquer Asia Minor early in 1205. Henry defeated Theodore Mangaphas and Theodore Laskaris' brother, Constantine, in the Battle of Adramyttion on 19March 1205. The Latins could not follow up their victory, because Tzar Kaloyan of Bulgaria stirred up a rebellion in Thrace and invaded the province. Kaloyan's invasion forced Emperor Baldwin to withdraw his knights from Anatolia. Kaloyan inflicted a crushing defeat on the Latin army in the Battle of Adrianople on 14 April 1205. Louis of Blois and Stephen of Perche perished in the battlefield. Baldwin was captured and died in captivity in Bulgaria.