Stephen succeeded to the County in 1097, following the death in the First Crusade of his elder brother, Reginald II. He participated in the Crusade of 1101, as a commander in the army of Stephen of Blois, helping with the capture of Ancyra and fighting in the disastrous Battle of Mersivan. Stephen would later die at the battle of Ramla in 1102. He was succeeded by his eldest son, Reginald III.