Martin Luther (1483-1546) was an Augustinian monk who began the Protestant Reformation as a reaction against what he perceived as a betrayal of Christian ideals by the wealthy and self-indulgent Catholic Church. The Church had long gone through cycles of corruption and reform, which was usually led by new religious orders of monks (such as the Franciscans and Dominicans in the early 13th century). Among Among Luther’s radical ideas was that the Catholic Church and the Papacy were so corrupt and far away from the teachings of Jesus that Christianity needed to be reestablished, rather than reformed.
Luther believed true Christian has been lost and needed a complete return to biblical foundations, not just institutional adjustments. This marked a major turning point in European religious history. Luther went further than earlier reforms by calling not for reform but for a fundamental rebirth of Christianity.