The ruins of the medieval Šášov Castle stand above the river Hron. According to a legend, the lord of the Zvolen Castle had it built for his court joker who saved his life while hunting.
The task of the Šášov Castle was to guard the trade road and to collect toll. It became royal property in the 14th century and part of the dowry of the royal wives. In 1490 the family of Dóczy bought it from Queen Beatrix and reconstructed it into the Renaissance fort. The castle fell in decay after the Rebellion of Estates in 1708. Only some walls survive.
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.