Karl Barth (1886-1968), widely regarded as the greatest theologian of the twentieth century, taught for many years at the University of Basel, Switzerland. He was one of the principle personalities of the Confessing Church in Germany that opposed Adolf Hitler and the Nazis. In addition to the monumental multivolume Church Dogmatics, his numerous writings include Evangelical Theology, The Gottingen Dogmatics: Instruction in the Christian Religion, Protestant Theology in the Nineteenth Century, The Theology of John Calvin, Fifty Prayers, The Epistle to the Romans, and The Epistle to the Philippians.