The Reformation was a major movement within Western Christianity in 16th century Europe that posed a religious and political challenge to the Catholic Church in particular to papal authority, arising from what was perceived to be errors, abuses, and discrepancies by the Catholic Church. The Reformation was the start of Protestantism and the split of the Western Church into Protestantism and what is now the Roman Catholic Church. It is also considered to be one of the events that signify the end of the Middle Ages and the beginning of the early modern period in Europe. Movements have been made towards a Reformation prior to Martin Luther, so some Protestants, such as Landmark Baptists, and the tradition of the Radical Reformation prefer to credit the start of the Reformation. Luther began criticizing the sale of indulgences, insisting that the Pope had no authority over purgatory and that the Treasury of Merit had no foundation in the Bible. The Reformation developed further to include