King Louis VII of France, also known as Louis the Young, reigned from 1137 to 1180. He was the son of King Louis VI and became king at a young age. His reign was marked by conflicts with the Plantagenets, particularly during the Second Crusade, which he led alongside Emperor Conrad III of Germany. Louis VII's marriage to Eleanor of Aquitaine was significant, as it brought vast territories to the French crown. However, their union ended in divorce, leading to Eleanor's marriage to Henry II of England. Louis's reign saw the strengthening of royal authority, despite challenges from powerful nobles.