John Calvin (10 July 1509 – 27 May 1564) was the leading French Protestant reformer and the most important figure in the second generation of the Protestant Reformation. He was a principal figure in the development of the system of Christian theology later called Calvinism, including its doctrines of predestination and of God's absolute sovereignty in the salvation of the human soul from death and eternal damnation. Calvin wrote a preface to a French translation of the Bible by his cousin Pierre Olivétan and then undertook what became the first edition of the Institutes, his masterwork, which, in its successive revisions, became the single most important statement of Protestant belief.
