Herzogenburg is an Augustinian monastery founded in 1112 by Ulrich I, Bishop of Passau, at St. Georgen an der Traisen. In 1244 because of frequent flooding it was moved up-river towards Herzogenburg. From 1714 the buildings were refurbished in the Baroque style by Jakob Prandtauer, Johann Bernhard Fischer von Erlach and Josef Munggenast. The monastery was able to survive the dissolutions enforced by Emperor Joseph II in the late 18th century. Until 1783 the monastery was in the Diocese of Passau, afterwards in the Diocese of St. Pölten.
The monastery church was established in about 1014 by Emperor Henry II and is dedicated to Saint Stephen the Protomartyr (after the patron of Passau Cathedral). In 1112 bishop Ulrich I gave the benefice of Herzogenburg to his newly founded monastery at St. Georgen, which moved to Herzogenburg in 1244.
There are few remains of the Gothic church (the portal and the second storey of the tower). The architect of the present church building was Franz Munggenast. The rebuilt church was dedicated on 2 October 1785 and was the last significant Baroque church built in Austria.
The emphasis of the collection is on late Gothic works such as panel paintings, sculptures and stained glass windows. The great banqueting hall, the treasury and the monastic library, as well as the coin cabinet, underline the art-historical importance of the priory in Lower Austria. The Baroque picture gallery is also notable, and does not only contain religious works. A particular curiosity is a well-preserved Roman helmet, dating from about 150 A.D., which was found in a gravel pit in the vicinity.
References:Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.