His reign lasted twenty-one years, and they were some of the most influential years in Church history. Leo earned the title "Saint," and was named a Doctor of the Church as well. Saint Leo was one of the greatest Pope's to lead the Catholic Church, and he created doctrine and ideas that are still used today. He was a great theologian and writer, and had far-reaching ideas that helped define doctrine and unify the Catholic Church. He helped save Rome from invaders and literally acted as the leader of Rome when the Church split into an eastern and western movement. Saint Leo's feast day was celebrated on November 10, and is now celebrated on April 11 of the Roman calendar.

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