Robert I of Dreux, nicknamed the Great (c. 1123 – 11 October 1188), was the fifth son of Louis VI of France and Adélaide de Maurienne.

[2] He held this title until 1184 when he granted it to his son Robert II.

[3] In 1145, he married Hawise of Salisbury,[4] becoming count of Perche, as regent to his stepson Rotrou IV.

By his third marriage to Agnes de Baudemont in 1152,[5] he received the County of Braine-sur-Vesle, and the lordships of Fère-en-Tardenois, Pontarcy, Nesle, Longueville, Quincy-en-Tardenois, Savigny, and Baudemont.

Agnes de Baudemont, Countess of Braine, widow of Milo III of Bar-sur-Seine (1130 – c.