Eustace III, Count of Boulogne

Eustace III (c. 1050 – c. 1125) was the count of Boulogne from 1087 succeeding his father, Eustace II. He joined the First Crusade, being present at Nicaea, Dorylaeum, Antioch, and Jerusalem. After fighting in the Battle of Ascalon, he returned home. He was offered the Kingdom of Jerusalem after the death of his brother King Baldwin I and set out to claim it, but returned when he received news of Baldwin of Bourcq's election to the throne. On his return to Boulogne, he founded a Cluniac monastery in Rumilly, retired as a monk, and died in 1125.