The Saviour Monastery of St. Euthymius was founded in the 14th century, and grew in importance in the 16th and 17th centuries after donations by Vasili III, Ivan IV and the Pozharsky family, a noble dynasty of the region. Among the buildings erected during this period were the Assumption Church, the bell tower, the surrounding walls and towers, and the seven-domed Cathedral of the Transfiguration of the Saviour. The cathedral was built in the style of the Grand Duchy of Vladimir-Suzdal. Its interior contains restored frescoes by the school of Gury Nikitin of Kostroma, dating from 1689. The tomb of Dmitry Pozharsky lies by the cathedral wall.
The monastery also contains a prison, built in 1764, which originally housed religious dissidents. The prison continued in use during the Soviet period, and among its better known prisoners was field marshal Friedrich Paulus, who was incarcerated here for a time after his surrender at Stalingrad. The prison now houses a museum about the monastery's military history.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.