Robert I of Dreux

Robert I of Dreux, called the Great (c. 1123–1188), was the fifth son of King Louis VI of France and Adelaide of Savoy. In 1137 his brother Louis VII granted him the county of Dreux as an appanage. He joined the Second Crusade in 1147, fighting at the failed siege of Damascus, then returned early and plotted against Louis VII, a conspiracy checked by Abbot Suger.

In 1152 his marriage to Agnes of Baudement brought him Braine and other lordships. He chartered Dreux in 1180, founded Brie-Comte-Robert, and ceded his county to his son in 1184.