war came to an abrupt end after John died in 1216, leaving the Crown to his nine-year-old son Henry III. Later in Henry's reign, Simon de Montfort led the barons in another rebellion, beginning the Second Barons' War. The war ended in a clear royalist victory and in the death of many rebels, but not before the king had agreed to summon a parliament in 1265. The next monarch, Edward Longshanks, was far more successful in maintaining royal power and was responsible for the conquest of Wales. He attempted to establish English domination of Scotland. However, gains in Scotland were reversed during the reign of his successor, Edward II, who also faced conflict with the nobility. In 1311, Edward II was forced to relinquish many of his powers to a committee of baronial "ordainers"; however, military victories helped him regain control in 1322. Nevertheless, in 1327, Edward was deposed by his wife Isabella. His 14-year-old son became Edward III. Edward III claimed the French Crown, setting off the Hundred Years' War between England and France. His campaigns conquered much French territory, but by 1374, all the gains had been lost. Edward's reign was also marked by the further development of Parliament, which came to be divided into two Houses; he died in 1377, leaving the Crown to his 10-year-old grandson Richard II. Like many of his predecessors, Richard II conflicted with the nobles by attempting to concentrate power in his own hands. In 1399, while he was campaigning in Ireland, his cousin Henry Bolingbroke seized power. Richard was deposed, imprisoned, and eventually murdered, probably by starvation, and Henry became king as Henry IV. Henry IV was the grandson of Edward III and the son of John of Gaunt, Duke of Lancaster; hence, his dynasty was known as the House of Lancaster. For most of his reign, Henry IV was forced to fight off plots and rebellions; his success was partly due to the military skill of his son, the future Henry V. Henry V's own reign, which began in 1413, was largely free from domestic strife, leaving the king free to pursue the Hundred Years' War in France. Although he was victorious, his sudden death in 1422 left his infant son Henry VI on the throne and gave the French an opportunity to overthrow English rule. The unpopularity of Henry VI's counsellors and his consort, Margaret of Anjou, as well