(Picture: Klaas Neumann)

Legend says that, on October 31st, 1517, Martin Luther nailed his 95 theses against the selling of indulgences to the door of the Castle Church in Wittenberg. It was an event with immense consequences: the Reformation transformed the world. How was Luther's posting of his theses remembered by politics, church and society during the course of the centuries – and what can be derived for the imminent 500th anniversary?