John Calvin (1509-1564) was a French theologian of the Protestant Reformation who developed a new Christian theology called Calvinism, a.k.a. Reformed theology. Calvin's name in French is Jean Cauvin. His ministry, centered in Geneva, Switzerland, attracted Protestant refugees and, over time, made that city a major force in the spread of Reformed theology. Calvin is renowned for his teachings and writings, in particular for his Institutes of the Christian Religion.