John Calvin was an influential French theologian and pastor during the Protestant Reformation. Calvin's writing and preachings provided the seeds for the branch of theology that bears his name. Originally trained as a humanist lawyer, he broke from the Roman Catholic Church around 1530. After religious tensions provoked a violent uprising against Protestants in France, Calvin fled to Switzerland. Calvin developed his theology in his biblical commentaries as well as in his sermons and treatises. Calvin produced commentaries on most of the books of the Bible. His first commentary on Romans was published in 1540, and he planned to write commentaries on the entire New Testament. However, it took six years before he wrote his second, a commentary on I Corinthians. He did not lose any more time in reaching his goal. By 1555 he had completed his work on the New Testament, and he also continued with commentaries on many of the books of the Old Testament as well. These commentaries have proved to be of lasting value to students of the Bible, and they are still in print after over 400 years.