في 1031، بعد وفاة والده الملك، شارك روبرت في تمرد ضد شقيقه، الذي كان مدعوما من قبل والدته، كونستانس من آرل .
In 1031, after the death of his father the king, Robert participated in a rebellion against his brother, in which he was supported by his mother, Constance of Arles.