Ehrenburg Palace was built by Johann Ernst, Duke of Saxe-Coburg, in 1543-47. It replaced the Veste Coburg as the Dukes' city Residenz. The new city palace was built around a dissolved Franciscan monastery.
According to tradition, the palace was named Ehrenburg ('Palace of Honour') by Emperor Charles V for having been constructed without the use of forced labour.
In 1690, a fire destroyed the northern part of the palace. This was an opportunity for Albert V, Duke of Saxe-Coburg, who had a new Baroque style palace built in 1699.
In the 19th century, Ernst I had the palace redesigned by Karl Friedrich Schinkel in Gothic Revival style, beginning in 1810. Between 1816 and 1840 the state apartments were redesigned in the French Empire style.
The palace is used as a museum today. Among other exhibits, it features art galleries with works by Lucas Cranach the Elder, Dutch and Flemish artists of the 16th and 17th centuries as well as romantic landscape paintings.References:
The Petersberg Citadel is one of the largest extant early-modern citadels in Europe and covers the whole north-western part of the Erfurt city centre. It was built after 1665 on Petersberg hill and was in military use until 1963. It dates from a time when Erfurt was ruled by the Electors of Mainz and is a unique example of the European style of fortress construction. Beneath the citadel is an underground maze of passageways that can be visited on guided tours organised by Erfurt Tourist Office.
The citadel was originally built on the site of a medieval Benedictine Monastery and the earliest parts of the complex date from the 12th century. Erfurt has also been ruled by Sweden, Prussia, Napoleon, the German Empire, the Nazis, and post-World War II Soviet occupying forces, and it was part of the German Democratic Republic (East Germany). All of these regimes used Petersberg Citadel and had an influence on its development. The baroque fortress was in military use until 1963. Since German reunification in 1990, the citadel has undergone significant restoration and it is now open to the public as a historic site.