The Marsvinsholm estate was spoken about as Bosöe, Borsöe and Bordsyö in the beginning of the 12th century. By the middle of the 14th century it was owned by members of Ulfeld family. The possession were transferred to Otto Marsvin around 1630, who built the castle 1644-1648 and renamed it after himself. The name is derived from an Old Norse word for porpoise. The castle was in the beginning built on poles in a small lake. It forms a square in 4 floors and the northeast and southwest corners are provided with towers in five floors. 1782-1786 count Erik Ruuth made a thorough renovation. 1856-1857 baron Jules Sjöblad restored the castle.
Through succession and sales the castle has belonged to the families Thott, von Königsmarck, de la Gardie, Sjöblad, Ruuth, Piper, Tornerhielm and Wachtmeister. Count Carl Wachtmeister sold the castle and the remaining land to arl Jules Stjernblad in 1854. The castle was handed down to his daughter, the duchess Ida Eherensvärd. Her children, Rutger, Louise and Madeleine Bennet owned it until 1910 when it was sold to dame Johannes Jahennesen. 1938 it was handed down to his daughter, Anna Margrethe and her husband Iörgen Wedelboe-Larsen. Their son sold 1978 to Bengt Iacobaeus. His son Mr Tomas Iacobaeus is the current owner of Marsvineholm.
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.