Oleśnica Castle was erected in 1542-1561, replacing a Gothic fortress from the thirteenth century. It was the seat of the Dukes of Oleśnica until the nineteenth century. A fortified settlement was mentioned before the year 1238, and the first record of the castle dates from 1292.
After World War II, the surviving buildings held Hungarian and Italian prisoners of war. Later, there was the Soviet branch office of the International Committee of the Red Cross. In the 1970s the castle underwent another renovation and it became a branch of the Archaeological Museum in Wroclaw, until abandoned in 1993. It has since been reoccupied by the Voluntary Labour Corps.
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.