Baldwin I (Baldwin of Boulogne), 1058?–1118, Latin king of Jerusalem (1100–1118), brother and successor of Godfrey of Bouillon , whom he accompanied on the First Crusade (see Crusades ). Separating from the main army after the successful siege of Nicaea, Baldwin followed Tancred into Cilicia and seized (1097) Tarsus from him. He wrested (1097) Edessa from the Muslims and as count of Edessa defended the city until elected ruler of Jerusalem. His election marked the triumph of the military faction of the Crusaders over the ecclesiastical faction. Taking the title of king, he consolidated the Latin states of the East. With the help of crusading fleets from the West and, more important, the Genoese and the Venetians, to whom he made large concessions, he gained possession of the chief ports of Palestine. He helped the Latin rulers of Antioch, Edessa, and Tripoli against the Muslims and fought against the Egyptians. He died on his return from an expedition into Egypt. His cousin, Baldwin II, succeeded him.
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