Sankt Pölten Cathedral has been the episcopal seat of the Diocese of Sankt Pölten since 1785, having previously been the church of the Augustinian Abbey of St. Pölten, dissolved in 1784. The building, despite being a well-preserved late Romanesque structure, is Baroque in appearance.
The use of the site for religious buildings is believed to date from around 790, when a Benedictine monastery was established here, to which were brought the relics of Saint Hippolytus, after whom the present city is named. In 828, the monastery became a possession of the Diocese of Passau, and a centre of missionary activity, predominantly in Great Moravia. After the invasion of the Magyars in around 907, the monastery was almost entirely destroyed, and was not rebuilt until after the Battle of Lechfeld in 955. The first documentary reference is in a charter of 976 from Emperor Otto II to Bishop Pilgrim of Passau.
Under Bishop Altmann of Passau the abbey became an Augustinian canonry, which was dissolved in 1784 as part of the Josephine Reforms.
In around 1150, the abbey church was rebuilt with three naves but no transept, with a westwork including two towers. In 1228 Bishop Gebhard changed the dedication, formerly to Saints Peter, Stephen and Hippolytus, to the Assumption of Mary. After a fire it was rebuilt again between 1267 and 1280. After another fire in 1621 the entire building was remodelled in the present Baroque style.References:
The Erfurt Synagogue was built c. 1094. It is thought to be the oldest synagogue building still standing in Europe. Thanks to the extensive preservation of the original structure, it has a special place in the history of art and architecture and is among the most impressive and highly rated architectural monuments in Erfurt and Thuringia. The synagogue was constructed during the Middle Ages on the via regia, one of the major European trade routes, at the heart of the historical old quarter very close to the Merchants Bridge and the town hall. Many parts of the structure still remain today, including all four thick outer walls, the Romanesque gemel window, the Gothic rose window and the entrance to the synagogue room.
After extensive restoration, the building was reopened in 2009. On display in the exhibition rooms is an collection of medieval treasures discovered during archaeological excavations. This includes 3,140 silver coins, 14 silver ingots, approx. 6,000 works of goldsmithery from the 13th and 14th centuries and an intricately worked wedding ring of the period, of which only two others are known to exist anywhere in the world. A mikveh (Jewish bath) has been excavated close by (13th/14th century). The Old Synagogue, the Small Synagogue and two Jewish cemeteries together form a network of historical buildings and sites which vividly portray the role of Jewish life in the history of Erfurt.