Mechtilde Lichnowsky

Princess Mechtilde Lichnowsky, originally '''Mechtilde Christiane Marie ''Gräfin von und zu'' Arco-Zinneberg, later Mechtilde Peto''' (8 March 1879, in Schloss Schönburg, Pocking now in the Kreis Passau – 4 June 1958, in London) was a German author, married to Karl Max, Fürst von Lichnowsky, 6th Prince and 8th Count Lichnowsky (1860–1928) who succeeded his father in 1901, and served as Imperial German Ambassador to the Court of St. James's, 1912–1914. In 1937 she married Ralph Harding Peto, grandson of Sir Samuel Morton Peto, 1st Baronet.

She was originally from the House of ''Von Arco-Zinneberg'', a branch of the Tyrolese House of Arco. Provided by Wikipedia