Peter_Wittgenstein--Czar_of_Russia_Alexander_I

Louis Adolf Peter, 1st Prince of Sayn-Wittgenstein-Ludwigsburg-Berleburg (German: Ludwig Adolf Peter Fürst zu Sayn-Wittgenstein-Berleburg; Russian: Пётр Христианович Витгенштейн, romanized: Pëtr Christianovič Vitgenštejn; Pyotr Christianovitch Wittgenstein; 17 January [O.S. 6 January] 1769 – 11 June 1843), better known as Peter Wittgenstein in English, was a Prince of the German dynasty Sayn-Wittgenstein and Field Marshal in the Imperial Russian Army during the Napoleonic wars. He was nicknamed the Saviour of Saint-Petersburg.