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Kaloyan was the younger brother of Ivan Asen I and Peter II.
In 1204 the Crusaders of the Fourth Crusade conquered Constantinople and founded the Latin Empire on the ruins of Byzantium, crowning Baldwin, Count of Flanders (IX) and Hainault (VI), as the Emperor of Constantinople.
In June 1207 Theodore I Lascaris agreed to a two year truce with the Crusaders, who were now under the command of Baldwin's brother Henry.