Godfrey of Bouillon
The Duchy of Bouillon's origins are unclear. The first reference to Bouillon Castle comes in 988 and by the 11th century, Bouillon was a freehold held by the House of Ardennes, who styled themselves Lords of Bouillon. On the death of Godfrey III, Duke of Lower Lorraine in 1069, Bouillon passed to his nephew, Godfrey of Bouillon. In 1095, Godfrey of Bouillon sold Bouillon to Otbert, the Prince-Bishop of Liège, in order to finance his participation in the First Crusade. Godfrey later became first ruler of the Kingdom of Jerusalem.