The imposing Swabian castle of Rocca Imperiale is on the top of the hill over which the whole residential area extends. The fortress was ordered by Frederic II of Swabia in 1221, and he ordered the construction or refurbishment of 200 castles for defensive purposes in southern Italy. The castle was built in a place of great military and strategic importance and surveillance extended to the whole of the Gulf of Taranto. The development of the residential area followed the construction of the castle, bringing in the people from a series of fortified settlements in the area. Many feudatory lords alternated in the government of the area, constantly under barbarian attack, in the following 200 years.
In 1664, the castle withstood the attack of 4000 Saracen pirates who devastated Rocca, destroying the old 13th century church in the old centre of which only the lovely Romanesque bell tower with mullioned windows and cornices remains. In 1989, the last heirs of the family owning the castle decided to donate it to the Municipality of Rocca Imperiale.
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.