He held great political influence during the first decade of the fule of Emperor Leopold I. As prime minister of Austria, he concluded a secret treaty with France on 19 January 1668 about the division of the Spanish monarchy and worked towards a Catholic triple alliance between Austria, France and Spain. He was, however, suspected of having had secret talks with king Louis XIV of France, who was alleged to have promised him a post as Cardinal and was suddenly relieved of his duties on 10 December 1669 and banished from the court. He was sentenced to death, however, this sentence was never effectuated. He lived the rest of his life on his estates in Carniola.
In 1673, he inherited the Lordships of Kočevje and Žužemberk from his elder brother Wolf Engelbrecht, Count of Auersperg.
^Herbert Schmidt: Der Silbererzbergbau in der Grafschaft Glatz und im Fürstentum Münsterberg-Oels. Von den mittelalterlichen Anfängen bis zum Niedergang, Tectum-Verlag, Marburg, 2003, ISBN 3-8288-8500-4, p. 18