disagreements with the Archbishop of Canterbury (the king's former chief adviser), Thomas a Becket, over Church-State relations ended in Becket's murder in 1170 and a papal interdict on England. Family disputes over territorial ambitions almost wrecked the king's achievements. Henry died in France in 1189, at war with his son Richard, who had joined forces with King Philip of France to attack Normandy. gone gambling pronouncing his eldest son Prince of Wales, and then attacking Scotland. Scotland was to remain elusive and retain its independence until late in the reign of the Stuart kings. In the reign of Edward III the Hundred Years War began, a struggle between England and France. At the end of the Plantagenet period, the reign of Richard II saw the beginning of the long period of civil feuding known as the gone gambling assertion that the King of Scotland owed feudal allegiance to him, and the embittered Anglo-Scottish relations leading to war which followed, were to overshadow the rest of Edward's reign in what was to become known as the 'Great Cause'. Under a treaty of 1174, William the Lion of Scotland had become the vassal to Henry II, but in 1189 Richard I had absolved William from his allegiance. Intermarriage between the English and Scottish royal houses promoted peace between the two countries until the premature death of Alexander III in 1286. In 1290, his granddaughter and heiress, Margaret the 'Maid