Martin Luther, (Eisleben, 1483, Eisleben, 1546). German reformer. Doctor of Theology and Augustinian priest. In 1517, outlined the main thesis of Lutheranism in Wittenberg. He was excommunicated in 1520. Martin Luther nailed to the door of the Wittenberg castle church his Ninety-Five Theses on the Power and Efficacy of Indulgences (31/10/1517). Colored engraving.