Eudes III was a French nobleman who lived during the 12th century. He was a member of the House of Châtillon and served as the Count of Blois from 1152 until his death in 1191. Eudes III was known for his involvement in the political and military affairs of his time, particularly during the conflicts between the French crown and the Plantagenets. Eudes III was also a participant in the Third Crusade, which aimed to reclaim Jerusalem from Muslim control. His contributions to the crusade and his role in regional politics helped shape the landscape of medieval France and its relationships with neighboring territories.