Prince Peter Khristianovich Wittgenstein (January 17 (January 6), 1769, Pereslavl-Zalessky - June 11, 1843, Lemberg) was a Russian Field Marshal distinguished for his services in the Napoleonic wars. Born Count Ludwig Adolf Peter of Sayn-Wittgenstein-Ludwigsburg, he was descended from a family of independent counts whose seat was in Berleburg. Wikipedia
The definitive Wikipedia entry for Peter Wittgenstein. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Peter_Wittgenstein