King Louis VIII of France reigned from 1223 to 1226. He was the son of King Philip II and became king after his father's death. Louis VIII is known for his efforts to strengthen the French monarchy and expand its territories, particularly in Languedoc. During his short reign, Louis VIII faced challenges, including conflicts with the English crown over territories in France. He was also involved in the Albigensian Crusade, which aimed to eliminate the Cathar heresy in southern France. Despite his brief rule, he laid the groundwork for future French kings.