Wars of the Roses a "sudden narrowing in the direct line of descent" near the end of his reign. His eldest son, Edward, the Black Prince, had died the year before. Edward III was succeeded on the throne by the Black Prince's only surviving son Richard II, who was only 10 years old. Richard's claim to the throne was based on the principle that the son of an elder brother had priority in the succession over his uncles. Since Richard was a minor, had no siblings, and had three living uncles at the time of Edward III's death, there was considerable uncertainty about who
Edward the Black Prince already warned his father of the intentions of the French king, but there was evidently a party at Edward's court that was jealous of his power, and his warnings were slighted. In April 1369, however, war was declared. Edward sent the Earls of Cambridge and Pembroke to his assistance, and Sir Robert Knolles, who now again took service with, him, added much to his strength. The war in Aquitaine was desultory, and, though the English maintained their ground fairly in the field, every day that it was prolonged weakened their hold on the country. On 1 January 1370 the Black