Freudenburg Castle was built between 1330 and 1337 by John, King of Bohemia and Count of Luxembourg. As part of a castle protectorate between Trier and Luxembourg, it served to secure the road between the cities of Trier and Metz.
During the 15th century the castle fell into disrepair until it was bought by the St. Maximin's Abbey in 1589. They had the castle restored. In a dispute between the abbey and the Archbishop-Elector of Trier; Philipp Christoph von Sötern, the troops of the Archbishop took the castle in 1646 and destroyed it. It was never rebuilt.
Freudenburg Castle was built at the end of a rocky spur. It was separated from the village by a broad dry moat cut out of the rock. Originally a wooden bridge would have given access to the castle from the village. The castle plan follows the outline of the spur, giving it a triangular ground plan.
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.