St. Constantine the Great, Roman Catholic emperor called the “Thirteenth Apostle” in the East he founded the Christian city of Constantinople to serve as his new capital, and undertook a long-sighted program of Christianization for the whole of the Roman Empire. May 21

St. Constantine the Great, Roman Catholic emperor called the “Thirteenth Apostle” in the East he founded the Christian city of Constantinople to serve as his new capital, and undertook a long-sighted program of Christianization for the whole of the Roman Empire. May 21