The Protestant Reformation began in the 15th century as a reaction against the corruption and abuse of power within the Catholic Church. Martin Luther publicly criticized the Church in 1517 and rejected key Catholic doctrines like salvation through good works. Over time, other reformers like Calvin, Zwingli, and Knox proposed ideas that differed and sometimes opposed Luther's teachings. The Reformation spread across Europe as kings and territories adopted Protestantism for political reasons, including in England where Henry VIII sought to annul his marriage, leading Parliament to split the Church of England from papal authority.