埃德萨伯国
Baldwin's cousin Baldwin of Boulogne and Tancred of Hauteville broke away from the main army to invade Cilicia around 15September 1097. Baldwin accompanied them in Boulogne's contingent. He also participated in Boulogne's military campaigns against the Seljuq rulers of the fortresses on the plains near the River Euphrates. After seizing Ravendel, Turbessel and Edessa, Boulogne established the first crusader state, the County of Edessa, in early 1098.