The Earl"s Palace is a ruined 16th-century castle. It was built by Robert Stewart, 1st Earl of Orkney (1533–1593), illegitimate son of King James V and his mistress Euphemia Elphinstone.
The castle was constructed in two phases. The first phase of work, begun in the 1570s, consisted of the great hall located in the south range, above the main door. Beside this was Lord Orkney"s private chamber in the south-east corner tower. An inscription above the entrance, dated 1574, marks this phase. The second phase, completed in the 1580s, saw a new range containing a great hall and chamber built on the north side of the courtyard. The second phase probably followed Robert"s acquisition of the Earldom of Orkney in 1581. After the death of Robert Stewart, the palace was used only occasionally by later earls of Orkney, and was not occupied after the mid-17th century. By 1701 the palace had begun to deteriorate badly.
The two-storey palace was constructed around a central courtyard and well, with large stone towers at three of the four corners. It was as much a fortress as a residence. Only the palace"s upper floors had large windows; the accessible ground floors were equipped with small openings and an array of gun-holes, from which musketeers could cover every side of the building.
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.