Ort castle was founded around 1080 by Hartnidus of Ort, and improvements continued to be made into the thirteenth century - for example by Hartnidus V in 1244. In 1344 the brothers Friedrich and Reinprecht I of Wallsee purchased the castle, which became Friedrich’s sole possession on January 25, 1350. The castle remained in the possession of the Wallsee family until 1483, when Schloss Ort passed to Frederick III, Holy Roman Emperor.
From 1484 to 1491, the castle was governed by Gotthard von Starhenberg, the Governor of Upper Austria. In 1492, Bernhard of Starhenberg and later his descendants ruled the castle until 1584. In 1588, the castle was purchased by Weikhard Freiherr of Pollheim, but he sold the castle on April 6, 1595 to the city of Gmunden. However, Gmunden sold the castle to Rudolf II that same year. The castle then passed to other owners before finally being acquired by Leopold I, Holy Roman Emperor.
In 1876, the castle was acquired by Archduke John Salvator of Austria (John of Tuscany) (1852 – ca. 1911), but on October 6, 1889, he renounced his title and connections to the Habsburg imperial house and changed his name to Johann Orth, the tenth and last child of Grand Duke Leopold II of Tuscany and Maria Antonietta of the Two Sicilies departing for South America in 1890 with his morganatic wife on his own ship, the St. Margaret. Johann Nepomuk Salvator was presumed lost at sea in 1890, and declared dead in 1911, but his actual date of death is unknown.
The castle was acquired by Franz Joseph I of Austria in 1914, and it was intended for students of Gmunden’s schools to be allowed to visit the castle, but this plan was interrupted by World War I.
At present the castle is being used for a study center of the Federal Ministry for Land and Forestry. On January 5, 1995, the castle was officially acquired by the city of Gmunden.
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.