In 1543, Duke Johann Ernst of Saxony decided to move his court from the Veste Coburg down into the city and chose the site of the dissolved Franciscan monastery, along which the city wall ran to the east. The monastery was in the area of the former middle courtyard. Recent research attributes the architectural design to the Saxon architect Nikolaus Gromann.[1] The building shows clear stylistic parallels with the work of Gromann, who may also have been close to the building project in organizational terms as the appointed court architect of Johann Ernst's half-brother, Elector Johann Friedrich. The complex was built until around 1547 under the construction management of Caspar Vischer.
A complex was created around two square courtyards, which could be entered from the south via Steingasse.[2] The buildings of the first courtyard with the stair tower, the corner bay window and the dormer windows from this period are still preserved.[3] Between the courtyards was the three-storey princely building, which was accessed via another large stair tower on the north side and had a large hall and a dining room. The palace chapel and other living quarters were located around the second courtyard on the east side, the kitchen on an irregular floor plan to the north and other subordinate rooms to the west. This complex can still be seen with various subordinate extensions on Bieler's floor plan from 1679. It is unclear whether the third courtyard with the stables had already begun in 1543. Only paid craftsmen were employed for the construction and not, as was usual at the time, serf laborers. This special feature is said to have been the reason for the visit of Emperor Charles V in 1547. Charles is said to have given the newly occupied complex the name Ehrenburg on this occasion. The new city palace was inhabited as the residence of a ruling duke until the death of Johann Ernst in 1553 and was then only used extensively.