Balthayock Castle is a medieval tower built in late 14th century. It is said to have been owned by family of Blair since the time of William I (1165-1214). It was very ruinous prior to 1870. James Maclaren saved the tower by building the present battlements, modern roof, caphouse, forestair to the entrance and also altered the interior. It was inhabited until the middle of the last century. It is now unoccupied but is in good condition.
In September 1594 James VI raised a force against the northern earls and met them at the battle of Glenlivet. When he was at Perth, Euphemia Douglas, the wife of the Master of Glamis wrote to Alexander Blair, laird of Balthayock asking him to come with Glamis Castle with his followers, armed and ready to follow the king to the north. In 1599 the young laird of Balthayock and Lawrence Blair with William Row, kirk minister at Kinnoull, were captured at Kinross by the Lord Sanquhar and imprisoned for two weeks.
The walls of castle are almost 10 ft thick and are made of sandstone and whin rubble. On the castle's east side an armorial panel displaying the date 1370 is present on the side of the stone stair. Another armorial with the initials AB (Blair) GM dated 1578 is located at the castle's southeast corner over an archway. Tusking in the building indicates the presence of a barmkin(tower house). The main block of the castle consists of three storeys, an attic and a wing of two storeys; the first floor of the wing is divided into a chamber and hall. It was remodelled in 1870 with the addition of a forestair, crenallated parapet and cap-house. It is now uninhibited but it is in considerably good condition.
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.