John Calvin (July 10, 1509 - May 27, 1564) was a French Protestant theologian during the Protestant Reformation and was a central developer of the system of Christian theology called Calvinism or Reformed theology. In Geneva, his ministry both attracted other Protestant refugees and over time made that city a major force in the spread of Reformed theology. He is renowned for his teachings and writings, in particular for his Institutes of the Christian Religion. 固opFoto