Next to Luther himself, Ulrich Zwingli (1484-1531) was probably the most important and certainly the most influential of the early Protestant reformers. His Commentary on True and False Religion, addressed to King Francis I of France and published by the printer Froschauer in Zurich in 1525, contrasted what Zwingli regarded as the true religion of the Protestants, grounded in Scripture, with the false religion of tradition and reason advocated by...