Louis IX, also known as Saint Louis, was the King of France from 1226 to 1270. He is remembered for his strong leadership and commitment to justice, often personally overseeing legal cases. Louis was a devout Christian and sought to promote peace and morality in his kingdom. He is also known for leading two Crusades, aiming to reclaim the Holy Land from Muslim control. Louis IX was canonized as a saint by the Catholic Church in 1297, and his legacy includes the establishment of the Sainte-Chapelle in Paris, a stunning Gothic chapel that houses important relics.