Career
He was an imperial count and the ruling Count of Königstein, Rochefort, Wernigerode and Hohnstein, as well as Lord of Eppstein, Münzenberg, Breuberg, Agimont, Lohra and Klettenberg
Ernest died on 9 November 1710. He was buried in the castle church at Ilsenburg on 21 December 1710. This trust fund was known as the Greizer Bequest.
lieutenant supported the poort and those in need in the County of Wernigerode until 1931.