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
Guy, Duke of Sorrento forever loyal to the Hauteville leadership, however. In 1073, he captured the rebel Herman, his own nephew, and handed him over to Robert Guiscard, his nephew-in-law. Guy died amidst the breakup of the great principality his brother had forged and he had preserved. With his death, Sorrento became independent once more. His children were: Guy, Duke of Sorrento Guy (; born c. 1012) was the duke of Sorrento from 1035, the brother of Guaimar IV of Salerno, father-in-law of William Iron Arm and William of the Principate, and brother-in-law of Humphrey of Hauteville. He was the son of Guaimar III