Edward II was the fourth son of Edward I, King of England, Lord of Ireland, and ruler of Gascony in south-western France (which he held as the feudal vassal of the king of France), and Eleanor, Countess of Ponthieu in northern France. Eleanor was from the Castilian royal family. Edward I proved a successful military leader, leading the suppression of the baronial revolts in the 1260s and joining the Ninth Crusade. During the 1280s he conquered North Wales, removing the native Welsh princes from power and, in the 1290s, he intervened in Scotland's civil war, claiming suzerainty over the country. He was considered an extremely successful ruler by his contemporaries, largely able to control the powerful earls that formed the senior ranks of the English nobility. The historian Michael Prestwich describes Edward I as "a king to inspire fear and respect", while John Gillingham characterises him as an "efficient bully".