Eustace II was a notable figure in the 12th century, serving as the Count of Boulogne from 1097 until his death in 1153. He was the son of Eustace I of Boulogne and Mary of Scotland, and he played a significant role in the First Crusade, participating in the capture of Jerusalem in 1099. Eustace was known for his military leadership and his involvement in various conflicts during his reign. Eustace II was also the brother of Godfrey of Bouillon, a prominent leader of the First Crusade who became the first ruler of the Kingdom of Jerusalem. Eustace's lineage and connections to the Crusades contributed to the political landscape of medieval Europe, influencing relationships between different noble families and the Church. His legacy is often associated with the early Crusader states and their establishment in the Holy Land.