A predecessor of current Oberhausen palace was a medieval castle about 200 meters away from today's location. This 12th or 13th century building has now completely disappeared. In 1443 the moated castle controlling an Emscher River passage fell to the von der Hoven clan based in the fiefdom of Kleve. In 1615, Overhus then passed on to become the domain of Conrad von Boenen. The castle was often plundered and seized due to its advantageous position at the important Emscher transition, as took place in the Eighty Years' War for example.
In the late 18th century Oberhausen was left to decay. In 1801 it was leased to Maximilian Friedrich Graf von Westerholt-Gysenberg and daughter-in-law Friederike Karoline von Bretzenheim, the illegitimate daughter of the Bavarian-Palatinate elector Karl Theodor. Because the neglected castle was deemed inappropriate for their social status, Maximilian Friedrich commissioned the architect August Reinking in 1803 to draw up plans for the renovation and extension of an approximately 200-metre-long inn and posting station to the north-west of the castle to become a neoclassical manor house. Schloss Oberhausen was constructed and fitted out according to these plans as a noble place of residency between approximately 1804 and 1820/1821. From 1808 the landscape architect and Dusseldorf court gardener Maximilian Friedrich Weyhe designed the manor house park and gardens.
In 1983 the collecting couple Peter and Irene Ludwig established the Ludwig Institut für Kunst der DDR (Ludwig Institute for Art of the German Democratic Republic) in Oberhausen with a permanent loan of 500 works dedicated to East German art, and brought with them works from Bernhard Heisig, Wolfgang Mattheuer, Willi Sitte and Werner Tübke. In 1996 Peter and Irene Ludwig initiated a new concept for the location in the form of the Ludwig Galerie Schloss Oberhausen.
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The Jan Hus Memorial stands at one end of Old Town Square. The huge monument depicts victorious Hussite warriors and Protestants who were forced into exile 200 years after Hus, and a young mother who symbolises national rebirth. The monument was so large that the sculptor designed and built his own villa and studio where the work could be carried out. It was unveiled in 1915 to commemorate the 500th anniversary of Jan Hus' martyrdom. The memorial was designed by Ladislav Šaloun and paid for solely by public donations.
Born in 1369, Hus became an influential religious thinker, philosopher, and reformer in Prague. He was a key predecessor to the Protestant movement of the sixteenth century. In his works he criticized religious moral decay of the Catholic Church. Accordingly, the Czech patriot Hus believed that mass should be given in the vernacular, or local language, rather than in Latin. He was inspired by the teachings of John Wycliffe.