All Saints' Church, commonly referred to as Schlosskirche, meaning "Castle Church" — to distinguish it from the "town church", the Stadtkirche of St. Mary — and sometimes known as the Reformation Memorial Church, is a Lutheran church in Lutherstadt Wittenberg, Germany. It has been called "the most famous building in Wittenberg", as the site where The Ninety-Five Theses were posted by Martin Luther on October 31, 1517, the act that has been called the start of the Protestant Reformation.