 Many Protestant reformers, including Martin Luther, John Calvin, Thomas Cranmer, John Thomas, John Knox, and Cotton Mather, felt the early church had been led into apostasy by the Papacy and identified it as the Antichrist.The reformers like Martin Luther, John Calvin and others disagreed with the papacy's claim of temporal power over all secular governments and the autocratic character of the papal office and challenged papal authority as it was a corruption from the early church and questioned the Catholic Church's ability to define Christian practice.In Western Christianity these issues both contributed to and are products of the Protestant Reformation.