John Ernest settled in the city of Coburg to build the Ehrenburg as his new residential palace, which was later also used and expanded by various Dukes of Saxe-Coburg.
Johann Ernst asus elama Coburgi linna, et ehitada Ehrenburg oma uueks residentsiks, mida hiljem kasutasid ja laiendasid erinevad Saksi-Coburgi hertsogid.