Henry I of France

Henry I crowned co-king at Reims - Robert II associates eldest surviving son after deaths of older brothers

Queen Mother Constance supports younger sons against Henry I - civil war erupts, Henry prevails with help from Robert of Normandy

Death of Robert II the Pious - Henry I becomes sole king after civil war with younger brothers

Henry I defeated by William of Normandy at Mortemer - French royal power at nadir, confined to Île-de-France

Philip I crowned co-king at age 7 - Henry I ensures succession before death

Death of Henry I - Philip I becomes king at age 8, regency of Baldwin V of Flanders