John Calvin, Theologian, (1509 – 1564) was a reformer in Geneva during the Protestant Reformation, tireless polemicist and apologetic writer. A French theologian and pastor, Calvin was a principal figure in the development of the system of Christian theology later called Calvinism. He attended the Collège de la Marche, Paris, where he learned Latin, studied Philosophy at the Collège de Montaigu, and enrolled in the University of Orléans to study law. In March 1536, Calvin published the first edition of his Institutes of the Christian Religion. His second edition was published in 1539, which systematically presented the main doctrines from the Bible. His Commentary on Romans, was published in March 1540.