Kreuzberg was first mentioned as Cruceberg in a document in 893. Around 1100, the settlement came under the ownership of the Counts of Are, who built an initial residential house for one of their administrators on Kreuzberg. It is often stated that the bergfried (keep) of the castle was built during the 15th century. However, it is quite possible that this part of Burg Kreuzberg belongs to the oldest section of the complex and dates back to the 14th century. French troops destroyed the castle in 1686.
Today the main castle rises on an almost triangular ground plan, following the structure of the artificial castle plateau. The area is surrounded by the inner curtain wall. On the north side of the main castle area stands the baroque, two-story residential building made of rubble stones.
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.