Reformation Day is a holiday celebrated by the Lutheran and Reformed Christian denominations on October 31, in memory of October 31, 1517, when Martin Luther sent his famous theses to local bishops to oppose Catholic indulgences, and nailed them to the door of a church in the city of Wittenberg. This event is considered the beginning of the Reformation in Europe.

Martin Luther is a man who fought for the establishment of justice in the church and the world. Five centuries ago, on a day that the Germans now call the Reformationstag, the actions of this theologian led to the beginning of the split of the Catholic Church. Luther affixed his 95 theses to the gates of the Castle Church in Wittenberg. They also contained a call to consider the Bible as the only spiritual support for all Christians, and not the church and the persons serving in it.

Church reforms touched the spiritual life of the Germans and led to a lot of changes in the political course, in the economy and in the public outlook. The state separated from the church and recognized the importance of civil rights: in the modern world, all people without exception have these rights, and in the 16th century people could not even dream of such benefits and opportunities. Reformationstag is a significant day for Protestants living not only in Germany, but also in other countries.