Louis III was a king of France who ruled from 1270 to 1285. He was the son of Louis IX, also known as Saint Louis, and became king after his father's death. Louis III's reign was marked by efforts to strengthen royal authority and maintain peace within the kingdom. During his rule, Louis III faced challenges from the nobility and external threats, particularly from England. He worked to consolidate power and improve the administration of justice. However, his reign was relatively short, and he died at a young age, leaving behind a legacy tied to his father's achievements.