Template:Wp-Baldwin I of Jerusalem

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Baldwin I, also known as Baldwin of Boulogne (1060s – 2April 1118), was the first count of Edessa from 1098 to 1100, and king of Jerusalem from 1100 to his death. He was the youngest son of Eustace II, Count of Boulogne, and Ida of Lorraine and married a Norman noblewoman, Godehilde of Tosny. He received the County of Verdun in 1096, but he soon joined the crusader army of his brother Godfrey of Bouillon and became one of the most successful commanders of the First Crusade.

While the main crusader army was marching across Asia Minor in 1097, Baldwin and the Norman Tancred launched a separate expedition against Cilicia. Tancred tried to capture Tarsus in September, but Baldwin forced him to leave it, which gave rise to an enduring conflict between them. Baldwin seized important fortresses in the lands to the west of the Euphrates with the assistance of local Armenians. Thoros of Edessa invited him to come to Edessa to fight against the Seljuks. Taking advantage of a riot against Thoros, Baldwin seized the town and established the first Crusader state on 10March 1098. To strengthen his rule, the widowed Baldwin married an Armenian ruler's daughter (who is now known as Arda). He supplied the main crusader army with food during the siege of Antioch. He defended Edessa against Kerbogha, the governor of Mosul, for three weeks, preventing him from reaching Antioch before the crusaders captured it.

Godfrey of Bouillon, whom the crusaders had elected their first ruler in Jerusalem, died in 1100. Daimbert, the Latin patriarch, and Tancred offered Jerusalem to Tancred's uncle, Bohemond I of Antioch. Godfrey's retainers took possession of the town and urged Baldwin to claim Godfrey's inheritance. Since a Muslim ruler had captured Bohemond, Baldwin marched to Jerusalem meeting little resistance. The Patriarch crowned him king in Bethlehem on 25December. He captured Arsuf and Caesarea in 1101, Acre in 1104, Beirut in 1110, and Sidon in 1111, with the assistance of Genoese and Venetian fleets and of several smaller crusader groups, but all his attempts to capture Ascalon and Tyre failed. After his victory at the third battle of Ramla in 1105, the Egyptians launched no further major campaigns against the Kingdom of Jerusalem.

Baldwin helped Bertrand, Count of Toulouse, to capture Tripoli in 1109. Being the only crowned monarch in the Latin East, Baldwin claimed suzerainty over other crusader rulers. Baldwin II of Edessa and Bertrand swore fealty to him. Tancred, who ruled the Principality of Antioch, also obeyed his summons. Baldwin supported Baldwin II and Tancred against Kerbogha's successor, Mawdud, who launched a series of campaigns against Edessa and Antioch in the early 1110s. He erected fortresses in Oultrejordainthe territory to the east of the Jordan Riverto control the caravan routes between Syria and Egypt. He died during a campaign against Egypt.