Constantine the Great (Emperor Constantine)

Constantine the Great was a Roman emperor who ruled from 306 to 337 AD. He is best known for uniting the Roman Empire and establishing Christianity as a favored religion through the Edict of Milan, which granted religious tolerance. Constantine also founded the city of Constantinople (modern Istanbul), making it the new imperial capital. His leadership helped transition the Roman Empire from traditional pagan beliefs to Christianity, shaping Western history. His reign marked a significant shift in religious and political power, laying foundations for the medieval Christian world.