The Protestant Reformation began in 16th century Europe in response to perceived corruption in the Catholic Church. Martin Luther posted his 95 Theses challenging Catholic doctrines like indulgences and the authority of the Pope. Luther's ideas spread rapidly through the printing press and inspired others to break away from the Catholic Church and form new Protestant faiths. The Reformation divided Europe along religious lines and led to conflicts between Catholics and Protestants, while some rulers like King Henry VIII of England switched their countries to the new Protestant faiths for political reasons. The Catholic Church fought back through the Counter Reformation, reforming itself while continuing to battle the growth of Protestantism.