Clough Castle is an excellent example of an Anglo-Norman castle with an added stone tower. A small kidney-shaped bailey lies south of a large mound, originally separated from it by a 2.1m deep ditch. On top of the 25 ft high motte is a stone tower, enlarged to become a tower house in the 15th century. It is sited off-centre as much of the rest of the top of the motte was occupied by a large hall, which apparently burned down. Around the motte is a ditch, and on the south-east side a low crescent shaped bailey, which was probably once joined to the motte by a wooden bridge.
Excavations on the summit of the mound in 1950 revealed that originally (in the late 12th or early 13th century) the top of the motte was surrounded by a timber palisade within which were pits for archers. Also found was the foundation of a long rectangular hall in the north-east half of the area, probably built in the mid 13th century. Later in the same century a small rectangular stone keep was built to the south-west, two storeys high and surviving to this day, having been conserved in 1981-82. In the late Middle Ages, after what appears to have been a period of disuse, it was restored and added to, resulting in an L-shaped tower house.
References:The Clementinum is a historic complex of buildings in Prague. Until recently the complex hosted the National, University and Technical libraries, the City Library also being located nearby on Mariánské Náměstí. The Technical library and the Municipal library have moved to the Prague National Technical Library at Technická 6 since 2009. It is currently in use as the National Library of the Czech Republic.
Its history dates from the existence of a chapel dedicated to Saint Clement in the 11th century. A Dominican monastery was founded in the medieval period, which was transformed in 1556 to a Jesuit college. In 1622 the Jesuits transferred the library of Charles University to the Klementinum, and the college was merged with the University in 1654. The Jesuits remained until 1773, when the Klementinum was established as an observatory, library, and university by the Empress Maria Theresa of Austria.