When his father died in August of 1026, as the oldest son, Richard III succeeded him as Duke of Normandy. By all accounts Richard III was accepted by the barons of Normandy and had no problems accepting his new role as duke. Richard III had given his younger son, Robert, the town of Exmes and the county of Hiemois. But once Richard III became duke, his younger brother Robert was not satisfied. He raided the diocese of his uncle Robert II, Archbishop of Rouen. He also captured his brother's city of Falaise. Robert's rebellion lasted through the end of 1026 and into early 1027. Finally Richard III laid to Falaise and brought the walls down. Robert surrendered and promised to be faithful.