I’m not sure John Calvin’s influence on Protestant Christian theology can be measured – it’s sort of like saying “there are a lot of stars in the sky” or “the Grand Canyon is big”. Born on July 10, 1509 in Noyon, France, he would continue to preach until his very last days. His book The Institutes of the Christian Religion is still regarded as one of the most important in Christian theology. This is a picture of his birthplace.