In 1772, his father died, and Ernest inherited the duchy of Saxe-Gotha-Altenburg. As a liberal and enlightened prince, he was interested in the arts and sciences and used his reign to further them. He promoted the educational system, the economy, theatre, art collections and libraries as well as the natural sciences in his duchy, which was thereby ranked in the top place of the Saxon duchies in Thuringia. Privately, he was particularly interested in astronomy and physics. He appointed competent specialists in all of these areas like the mechanic and clockmaker
Johann Andreas Klindworth to whom he granted the title of court mechanic. For his special interests, he employed the services of the important astronomer
Franz Xaver von Zach for Gotha. With him, he established the
Observatory of Gotha (
Sternwarte Gotha), which developed into a European centre of astronomy. His will stated that this institution should survive as the only visible indication of his existence. It was so successful that Gotha, despite its size, was thought of as a place that important people of the time should visit. One such person was
Goethe, who visited several times. Under the influence of the
French Revolution, he wanted to abdicate and emigrate to
Switzerland or the
United States, for which purpose he had his court officials acquire land in the
Montgomery area in
Ohio and commissioned
Joseph Ramée to design a country house in 1796. Ultimately, however, he remained in Gotha. In 1790, Ernest was appointed knight of the
Order of the Garter. Due to his
aunt's marriage with
Frederick, Prince of Wales, in 1736, he was a cousin of
King George III. The formal investiture took place in April 1791 at
Friedenstein Palace. After Ernest's death, the insignia were handed back to the order in 1804. ==Freemasonry==