The House of Manderscheid was the most powerful noble family in the Eifel region of Germany for a considerable period of time in the 15th century. In 1457, Dietrich III von Manderscheid was made a Reichsgraf by the Emperor. When Dietrich died on 20 February 1498, he had appointed his sons Johann, Konrad and Wilhelm as new rulers – the family property had been distributed in 1488. Each of the sons founded a powerful lineage: Johann started the Manderscheid-Blankenheim-Gerolstein line, William the Manderscheid-Kail line, and Konrad (Cuno) the Manderscheid-Schleiden line. Augusta von Manderscheid-Blankenheim was the last countess. She was married to a member of the Bohemian nobility, Count Philipp Christian von Sternberg (1732–1811), whose issue became Counts of Sternberg-Manderscheid.