The manor of Ekolsund was established in the 1300s. The first known owner was the council Magnus Knutsson, mentioned in 1351. In the 1500s the castle came into royal hands when King Gustav Vasa took over the ownership. It was in 1578-1611 the residence of Princess Sophia of Sweden.
The crown anyway donated Ekolsund to Åke Tott in 1618. Ekolsund was moved again to the Crown during Karl XI’s reduction, and in 1716 it was appointed to Landgraf Fredrik of Hessen-Kassel (later Fredik I). In 1747 it was sold to Prince Adolf Fredrik on the account of the new heir Gustav (later Gustav III). In 1785, Ekolsund was sold from the hands of the Crown to George Seton, a man of Scotish heritage. In 1917 it was bought by Carl Kempe. In 2002, Ekolsund was bought by a private firm.
Both southern and northern castle was built in the middle of the 1600s, excedran came centuries later. Architects were Simon de la Vallée, Nicodemus Tessin the Elder, Carl Harleman, Carl Fredrik Adelcrantz and Jean Eric Rehn.
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.