All Saints' Church, commonly referred to as Schlosskirche (Palatial Church) to distinguish it from the Stadtkirche (Town Church) of St. Mary – and sometimes known as the Reformation Memorial Church – is a Lutheran church in Wittenberg, Germany. It is the site where, according to university custom, the Ninety-Five Theses were posted by Martin Luther on 31 October 1517, the act that has been called the start of the Protestant Reformation.