After the armies of the Fourth Crusade seized Constantinople, the Byzantine capital, in 1204, they established a new empire on previously Byzantine territories and continued to fight the states which emerged from the Byzantine Empire - the Despotate of Epiros in Europe and the Nicaean Empire in Asia Minor. Its Emperor Baldwin I rejected the peace proposal of the Bulgarian Emperor Kaloyan and on the following year the Crusader army was annihilated by the Bulgarians in the battle of Adrianople and Baldwin himself was captured and died as a prisoner in Tarnovo.