Baldwin of Boulogne (died April 2, 1118) was one of the leaders of the First Crusade, who became the first Count of Edessa and then the second ruler and first titled King of Jerusalem. He was the brother of Godfrey of Bouillon, who was the first ruler of the crusader state of Jerusalem, although he refused the title of 'king' which Baldwin accepted. Wikipedia
The definitive Wikipedia entry for Baldwin of Boulogne. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Baldwin_I_of_Jerusalem