Robert I, Count of Dreux

In 1137 he received the County of Dreux as an appanage from his father.[2] He held this title until 1184 when he granted it to his son Robert II.

In 1139 he married Agnes de Garlande.[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.[6]

Robert I participated in the Second Crusade and was at the Siege of Damascus in 1148.[7] In 1158 he fought against the English and participated in the Siege of Séez in 1154.

1. Agnes de Garlande (1122–1143), daughter of Anseau de Garlande, count of Rochefort.[3]

• Simon (1141 – bef. 1182), lord of La Noue

2. Hawise of Salisbury (1118–1152), widow of Rotrou III and daughter of Walter Fitz Edward of Salisbury, Sheriff of Wiltshire

• Adèle of Dreux (1145 – aft. 1210), married firstly Valéran III, count of Breteuil,[8] secondly Guy II, lord of Châtillon-sur-Marne,[9] thirdly Jean I de Thorotte, fourthly Raoul III de Nesle, count of Soissons.[10]
• Alice or Adelheid (1144–?)

3. Agnes de Baudemont, Countess of Braine, widow of Milo III of Bar-sur-Seine (1130 – c. 1202).[6]

• Robert II (1154–1218), count of Dreux and Braine.[11]
• Henry (1155–1199), bishop of Orléans
• Alix (1156 – aft. 1217), married Raoul I, lord of Coucy[10]
• Philippe (1158–1217), bishop of Beauvais.[11]
• Isabella (1160–1239), married Hugh III of Broyes[12]
• Peter (1161–1186)
• William (1163 – aft. 1189), lord of Braye, Torcy, and Chilly
• John (1164 – aft. 1189)
• Mamilie (1166–1200)
• Margaret (1167–?), nun

The Sicilian chancellor Stephen du Perche may also have been a son (legitimate or not) of his.

• Dyggve, Holger Petersen (1935). "Personnages historiques figurant dans la poésie lyrique française des XII e et XIII e siècles. III: Les dames du »Tournoiement» de Huon d'Oisi". Neuphilologische Mitteilungen. 36 (2).CS1 maint: ref=harv (link)
• Dyggve, Holger Petersen (1942). "Personnages historiques figurant dans la poésie lyrique française des XII e et XIII e siècles XIV: Identification de Noblet, ami de Conon de Béthune, Gace Brulé et Pierre de Molins". Neuphilologische Mitteilungen (in French). Vol. 43, No. 1: 7-20.CS1 maint: ref=harv (link)
• Fedorenko, Gregory (2013). "The Thirteenth Century Chronique De Normandie". In Bates, David (ed.). Anglo-Norman Studies XXXV: Proceedings of the Battle Conference 2012. The Boydell Press.CS1 maint: ref=harv (link)
• Gilbert of Mons (2005). Chronicle of Hainaut. Translated by Napran, Laura. The Boydell Press.CS1 maint: ref=harv (link)
• Michel, Edmond (1902). Histoire de la ville de Brie-Comte-Robert (in French). Vol.1. Dujarric & Cie.CS1 maint: ref=harv (link)
• Previté-Orton, C. W. (1979). The Shorter Cambridge Medieval History. Vol. 1, The Later Roman Empire to the Twelfth Century (10th ed.). Cambridge University Press.CS1 maint: ref=harv (link)
• Pollock, M. A. (2015). Scotland, England and France After the Loss of Normandy, 1204-1296: Auld Amitie. Boydell & Brewer.CS1 maint: ref=harv (link)
• Power, Daniel (2004). The Norman frontier in the twelfth and early thirteenth centuries. Cambridge University Press.CS1 maint: ref=harv (link)
• Suger (2018). Selected Works of Abbot Suger of Saint Denis. The Catholic University of America Press.CS1 maint: ref=harv (link)
• Wood, Charles T. (1966). The French Apanages and the Capetian Monarchy, 1224-1328. Harvard University Press.CS1 maint: ref=harv (link)