Calvin was a French theologian and a major figure of the Protestant Reformation. In 1531, he became part of a movement that emphasized salvation by grace rather than by works. By 1555, Calvin had succeeded in establishing a theocracy in Geneva, where he served as pastor and head of the Genevan Academy and wrote the sermons, biblical commentaries, and letters that form the basis of Calvinism. What theologian, whose arrest was ordered by Calvin, was burned atop a pyre of his own books? Discuss