The Reformation, also known as the Protestant Reformation or the European Reformation, was a time of major theological movement in Western Christianity in 16th-century Europe that posed a religious and political challenge to the papacy and the authority of the Catholic Church hierarchy. Towards the end of the Renaissance, the Reformation marked the beginning of Protestantism. It is considered one of the events that signified the end of the Middle Ages and the beginning of the early modern period in Europe.
The Reformation is usually dated from Martin Luther's publication of the Ninety-five Theses in 1517, which gave birth to Lutheranism. Prior to Martin Luther and other Protestant Reformers, there were earlier reform movements within Western Christianity. The end of the Reformation era is disputed among modern scholars.
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