Martin Luther was a German theologian and religious reformer who had much influence on Christianity and incited the 16th-century Protestant Reformation. He gave rise to a movement through his words and actions that redeveloped specific basic tenets of the Christian religion. It resulted in the division of Western Christendom between Roman Catholicism and the new Protestant religions, including Lutheranism, Calvinism, the Anglican Communion, the Anabaptists, and the Antitrinitarians.