The Catholics had the advantages of tradition and unity; the Protestants enjoyed more liberty of belief, and they divided into Lutherans, Calvinists, Anabaptists, and Unitarians; even among the Lutherans there was a war of creeds between the followers and the opponents of the liberal Melanchthon. In 1577 the Lutherans formulated their faith in the Book of Concord, and thereafter Calvinists were expelled from Lutheran states.
