Hartenstein Castle was called the 'Pearl of the Ore Mountains'. The first known owner was Meinher I von Werben, who was Burgrave of Meißen in 1173. From 1406 the county of Hartenstein with the associated villages, forests and castles was pledged to the Schönburg family. In 1439 Veit II von Schönburg married Anna von Plauen from the Reuss family . This settles the long-standing differences between the two families over ownership of the county of Hartenstein (with the castles Hartenstein and Stein).
In the 16th century, the castle was rebuilt into a castle under Ernst II von Schönburg. The year 1530 and a Schönburg coat of arms stone above the gate of the main castle refer to these modifications. In 1572, Hugo II von Schönburg- Waldenburg had further modifications or repairs carried out. In 1584 the former armory in the inner castle was converted into a chapel. In 1606 the new castle tower was built.
At the beginning of the 19th century, Prince Friedrich Alfred von Schönburg rebuilt it in the neo-Gothic style, which was partially reversed in the early 20th century (before 1945). The complex had an oval floor plan and existed until the end of April 1945. In the last days of the war, SS units holed up in the Hartenstein Forest, whereupon the castle was almost completely destroyed by American bombs on April 20, 1945. The remaining buildings in the outer courtyard were used for residential purposes after the war. The ruin itself served as an open-air stage.
Since 2002 the association 'Schlossruine Hartenstein eV' has been trying to preserve and partially rebuild the castle.
After the prince robbery in Altenburg (on the night of July 8, 1455), a troop of kidnappers under the knights Wilhelm von Mosen and Wilhelm von Schönfeld allegedly handed over the young Prince Ernst of (Elector) Saxony on July 11, 1455 at Hartenstein Castle Friedrich XX. von Schönburg (since 1446 Lord von Waldenburg and co-owner of Glauchau) against assurance of impunity. The kidnappers had to leave Saxony forever (exile). Friedrich XX leads the prince from here to Chemnitz to his father, the Elector Friedrich the Meek (1428–1464).
According to other sources, the handover should have taken place at Stein Castle near Hartenstein (and the prince was probably only brought to Hartenstein Castle afterwards).
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.