Montfort Castle was built by the Counts of Veldenz around the year 1200. The first known dweller at the castle was Eberhard von Lautern (1182-1240). Lautern family owned the castle until 1432. In 1456 the army of archbishop of Mainz and Elector Palatine Frederick I destroyed the castle in local feud.
Despite some repairs Montfort stayed ruined several centuries until the remains where repaired in the 20th century. Today the castle can be visited free. There is also a small museum.
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.