The Reformation began in 1517 when Martin Luther protested corrupt practices of the Roman Catholic Church. Over the next 40 years, Protestantism was established in Europe. The Reformation was influenced by religious, cultural, political, and economic factors. Martin Luther posted his 95 theses criticizing indulgences in 1517, and was later excommunicated in 1521 for heresy. The Reformation led to the establishment of Protestantism and a split from the Catholic Church.