Metternich and the duchess

"Prince Klemens Wenzel von Metternich (full name German: Klemens Wenzel Nepomuk Lothar, Fürst von Metternich-Winneburg zu Beilstein, anglicised as Clement Wenceslas Lothar von Metternich-Winneburg-Beilstein; 15 May 1773 ? 11 June 1859) was a German politician and statesman of Rhenish extraction and one of the most important diplomats of his era, serving as the Foreign Minister of the Holy Roman Empire and its successor state, the Austrian Empire, from 1809 until the liberal revolutions of 1848 forced his resignation....Katharina Friederike Wilhelmine Benigna, Princess of Courland, Duchess of Sagan (born 8 February 1781 in Mitau, Duchy of Courland and Semigallia; died 29 November 1839 in Vienna, Austrian Empire) was a German noble from the Ruling family of Courland and Semigallia (today part of Latvia) and a sovereign Duchess of Sagan. Wilhelmine is mainly known for her relationship with Klemens Metternich, a statesman of the Austrian Empire."--Wikipedia.