Johann David Ludwig Graf Yorck von Wartenburg (born von Yorck; 26 September 1759 – 4 October 1830) was a Prussian Generalfeldmarschall instrumental in the switching of the Kingdom of Prussia from a French alliance to a Russian alliance during the War of the Sixth Coalition.
Ludwig van Beethoven's "Yorckscher Marsch" is named in his honor.
The Field Marshal's surname is Yorck; Wartenburg is a battle-honour appended to the surname as a title of distinction (cf.
Source: 'Scan aus dem Katalog der Ausstellung Macht und Freundschaft. 1800-1860 Berlin - St. Petersburg. Stiftung Preussische Schlösser und Gärten Berlin-Brandenburg. Verlag Koehler & Amelang Leipzig. Berlin 2008. License: CC-PD-Mark PD-Art (PD-old-100)