King Louis XIII of France reigned from 1610 to 1643. He became king at a young age after the assassination of his father, Henry IV of France. His reign was marked by the influence of his chief minister, Cardinal Richelieu, who helped strengthen the monarchy and centralize power in France. Louis XIII is known for his support of the arts and culture, which led to the flourishing of French theater and literature. He also played a significant role in the Thirty Years' War, aligning France with Protestant nations against the Habsburgs. His reign laid the groundwork for the absolute monarchy that would be fully realized under his son, Louis XIV.