The first recorded mention of Holligen is in 1257, when it was owned by the Teutonic Knights commandry of Köniz. It is likely that there was a castle here to control the Bümpliz-Köniz road and administer the estates. However, very little is known of this building. The current castle was built around 1500 by the Bernese Schultheiss Wilhelm von Diesbach. It was built in the style of a typical Burgundian castle, with a square donjon of massive stone blocks with four towers at the corners. A residential hall with a staircase tower was added around 1575 for Peter von Graffenried.
A map by Thomas Schöpf from 1577 and a city plan from 1623/24 both show the castle surrounded by a ring wall with several small towers. Between the 1624 plan and 1667, the square castle was expanded with the construction and expansion of the residential hall to the west. In the 18th century the castle was renovated in the Baroque style. The facade and windows were redone in 1765.
Between 1991-1994 the castle was extensively renovated and repaired. Today it is owned by the Turmstiftung Schloss Holligen, a foundation that maintains the castle.
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.