Answer:
Martin Luther's "95 Theses" began the Reformation, which was a movement for a religious reform.
Step-by-step explanation:
Reformation was a broad religious and socio-political movement in Western and Central Europe of the 16th and early 17th centuries, aimed at reforming the Catholic Church.
Martin Luther, the doctor of theology of Wittenberg University, is considered to have caused its beginning: on October 31, 1517 he published his “Ninety Five Theses”, in which he opposed the existing abuses of the Catholic Church, in particular against the sale of indulgences. In addition to Luther, the Reformation was joined by a number of other theologians whose views differed greatly from Luther's ideas. Thus, the division of the Catholic Church not only ended with the birth of the Lutherans, but also gave birth to the Anglican and Reformed Church, and to a multitude of different free paths. In addition to Luther, the most important were Ulrich Zwingli, Philipp Melanchthon and John Calvin.
Historians consider the end of the Reformation to be the signing of the Peace of Westphalia in 1648, following which the religious factor ceased to play a significant role in European politics.