Metternich Castle is an ancient castle in the Rhineland-Palatinate state of the Federal Republic of Germany. It is also known as the Beilstein Castle (Beilstein Burg), due to its location in Beilstein, Rhineland-Palatinate.The history of the castle goes back to 1268 when the castle (referred to as Bilstein Castle) was first mentioned. It is thought the castle is even older, with some historians indicating 1129 as the year of construction.In 1637, the castle became the property of the House of Metternich, hence its current name, Metternich Castle. The last member of the family to own the castle was Klemens von Metternich, one of the most famous diplomats of the Austrian Empire – he was foreign minister from 1809 to 1848.In 1689, during the Nine Years' War, the castle was destroyed by French troops.