Robert I, Duke of Normandy the father of: Robert I, Duke of Normandy Robert the Magnificent (; 22 June 1000 – 1–3 July 1035), was the Duke of Normandy from 1027 until his death in 1035. Owing to uncertainty over the numbering of the Dukes of Normandy he is usually called Robert I, but sometimes Robert II with his ancestor Rollo as Robert I. He was the son of Richard II and brother of Richard III, who preceded him as the Duke. Less than a year after his father's death, Robert revolted against his brother's rule, but failed. He would later inherit Normandy after his
Hoël II, Duke of Brittany in the east and the House of Cornouaille in the west may have further strengthened Brittany at a time when external interference was attempted by William the Conqueror. After Hawise's death in 1072, Hoël acted as regent for his son, Alan IV, until the latter reached his majority in 1084. During his reign he faced several rebellions from Breton nobles. Geoffrey Grenonat of Rennes (a natural son of Duke Alan III of Brittany and thus a half-brother of Hawise) led a revolt and was joined by Ralph de Gael who had returned to Brittany from England after the failure of