Carrickabraghy Castle (Caisleán Charraig Bhrachaí) on a rocky outcrop at the north-western extremity of the Isle of Doagh in the north of Inishowen, a peninsula on the north coast of County Donegal, Ireland.
From the 9th to the 13th century Inishowen was politically divided into three 'tuatha' or districts. These were known as Aileach in the south, Bredach to the east and Carraig Bhrachai to the west. The Lords of Carraig Bhrachai ruled from the town-land of Carrickabraghy, the area where the Castle now stands. They were one of the most important families in Inishowen.
Carraig Bhrachai is not mentioned again in the history books until 1600. The present remains of the castle are thought to have been built around this time. The O Dochartaigh Clan had risen into power in Inishowen and the Chief of the clan and Lord of Inishowen was Sean Og O Dochartaigh. The English invasion of Ireland was well underway, and to protect his livestock and supplies from English raids, Sean Og decided the best place to store them was on The Isle of Doagh.
Around 1665 Carrickabraghy Castle was abandoned, and began to decline for several centuries.
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.