A first prison, the "Zellengefängnis" (Cell Prison) on "Lehrter Strasse" was built between 1842 and 1849 by order of King Frederick William IV of Prussia, according to the "separate system" of Pentonville Prison. In 1878 Max Hödel, who had shot at Emperor Wilhelm I of Germany, was beheaded here. Political activists like Karl Radek, Erich Mühsam and Musa Cälil were detained in Moabit. Wilhelm Voigt, the "Hauptmann von Köpenick", and the writer Wolfgang Borchert served their prison sentences in the prison.