Oporów Castle is built of bricks in the Gothic architectural style in between 1434–1449 in the village of Oporów The castle was raised by the Deputy Chancellor of Poland (1429-1434), and highly regarded religious leader Władysław Oporowski.
The first wooden stronghold located in Oporów was recorded in the fourteenth century. The castle is said to have been raised by Mikołaj Oporowski and his son Władysław Oporowski, a highly regarded political and religious leader in the Kingdom of Poland, which in 1428 took on the estate as his own. Up until the eighteenth century the castle was owned by several families: House of Sołołobów, Korzeniowski, Pociejów and the House Oborski. The residence had only once ever been hit by any sort of devastation - in 1657 the castle's top levels caught fire - however, all of the castle was reconstructed. In 1930 the castle was transferred to the Society of the Credit of Land in Warsaw (Polish: Towarzystwo Kredytowe Ziemskie w Warszawie). After World War II the castle was nationalised and reconstructed. In 1949 the castle began housing a museum.
References:Rosenborg Palace was built in the period 1606-34 as Christian IV’s summerhouse just outside the ramparts of Copenhagen. Christian IV was very fond of the palace and often stayed at the castle when he resided in Copenhagen, and it was here that he died in 1648. After his death, the palace passed to his son King Frederik III, who together with his queen, Sophie Amalie, carried out several types of modernisation.
The last king who used the place as a residence was Frederik IV, and around 1720, Rosenborg was abandoned in favor of Frederiksborg Palace.Through the 1700s, considerable art treasures were collected at Rosenborg Castle, among other things items from the estates of deceased royalty and from Christiansborg after the fire there in 1794.
Soon the idea of a museum arose, and that was realised in 1833, which is The Royal Danish Collection’s official year of establishment.