sentences:  He was principally active in Wittenberg, Saxony, the town where Martin Luther is said to have nailed the Ninety-five Theses to the door of the Castle Church, initiating the Reformation.Rhau's support as a printer was critical to Luther's success.Born in the Thuringian town of Eisfeld, then part of Ernestine Saxony, Rhau from 1513 onwards studied philosophy at the newly established University of Wittenberg.