During the 12th century, there appears to have been a tower and wooden fort at the site of the present Erpeldange castle. In the 13th century, Frederic and Gerard d'Erpeldange, the first lords of Erpeldange, built a fortified stone castle guarding the valley at the point where the River Sûre meets the Alzette. The property passed successively into to the hands of the Counts of Vianden, and the Brandenburg-Outscheid and von Moestroff-Kerpen families.
Through marriage, the Gondersdorf family inherited the castle and in 1630 transformed it into a luxurious residence for their daughter. In 1677, it was inherited by Charles François baron de Failly de Sancy and Marie Marguerite de Giraldin. By that time, it was no longer of any military value as a quiet park had replaced its defences. Abandoned by the Prel family in the 19th century, it was used as a rectory. During the Second World War, the castle was damaged as a result of its use first by the Germans and then by American troops.
The castle changed hands a number of times until it was acquired by the State in 1983. The commune's administrative offices have been housed there since 1987. The building still contains two fine Renaissance fireplaces.
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.