Geras Abbey is a Premonstratensian monastery founded in 1153 as a daughter house of Seelau Abbey by Ekbert and Ulrich of Pernegg. It was and settled by canons from Seelau. Geras Abbey was able to survive the reforms of the Emperor Joseph II and the consequent monastery closures of 1783, and remains in operation to this day.
The abbey church is a Romanesque basilica which was reworked in the Baroque style in the 18th century by the architect Josef Munggenast and the fresco painter Paul Troger. Today the abbey is often used as a venue for classical music recitals.
References:The Chapel of St. Martin is the only completely preserved Romanesque building in Vyšehrad and one of the oldest in Prague. In was built around 1100 in the eastern part of the fortified outer ward. Between 1100 and 1300, the Rotrunda was surrounded by a cemetery. The building survived the Hussite Wars and was used as the municipal prison of the Town of the Vyšehrad Hill.
During the Thirty Years’ War, it was used as gunpowder storage, from 1700 to 1750, it was renovated and reconsecrated. In 1784, the chapel was closed passed to the military management which kept using it as a warehouseand a cannon-amunition manufacturing facility. In 1841, it was meant to be demolished to give way to the construction of a new road through Vyšehrad. Eventually, only the original western entrance was walled up and replaced with a new one in the sountren side. The dilapidating Rotunda subsequently served as a shelter for the poor.