St. Louis de France, also known as King Louis IX of France, was a medieval monarch who reigned from 1226 to 1270. He is celebrated for his strong sense of justice, commitment to the Christian faith, and efforts to improve the welfare of his subjects. Louis IX led two crusades and is remembered for his role in promoting peace and legal reforms in France. He was canonized as a saint by the Catholic Church in 1297, making him the only French king to be recognized as a saint. His feast day is observed on August 25, and he is the patron saint of France and sick people.