The first written mention of the castle in Olomouc is included in the Cosmas Chronicle in 1055. The king Wenceslas III, the last Přemyslid, also stayed at the castle and was assassinated here in 1306. In 1767 the young Mozart stayed in the house of the Chapter Provost on the castle grounds and composed Symphony No. 6 in F major here. Some of the recent celebrities who have visited the site are Mother Theresa or Pope John Paul II.
After being partially damaged during the Thirty Years’ War, the medieval castle grounds were reconstructed in the Baroque style over a period of almost one century. Today, there remains little visible evidence of the significance and power of this castle. As time went on, the castle was overbuilt with religious buildings and the Wenceslas cathedral.
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.