Ostrogski Palace site was bought by Prince Janusz Ostrogski in early 17th century. As the area had been still a suburb of Warsaw and exempted from the laws of the city which prevented the inhabitants from building private fortifications, Ostrogski decided to build a small castle there. For that he financed a bastion on which the manor was to be constructed. However, it was not until after his death that the manor itself was started. Designed by Tylman of Gameren, the palace built on top of the bastion was to become one of the wings of a huge future palace. However, it was never completed and was bought by deputy chancellor of the crown Jan Gniński, who turned it into his seat.
In 1725 the palace was bought by yet another magnate family, the Zamoyski, who made it a seat of their jurydyka. However, as the unfinished manor lacked many features of an 18th-century magnate palace, it never served its original purpose and with time became neglected. Since 1778 it was divided onto small flats and started serving as a hostel for students, owned by Marcin Nikuta. Converted into a military hospital by the French in 1806, between 1812 and 1817 it was abandoned and gradually fell into disrepair. During the November Uprising it was bought by the Polish government and refurbished to become a military hospital once again. Turned over to civilian authorities in 1836, it continued to be a hospital until 1859, when it was bought by the Musical Institute. It was there that both Stanisław Moniuszko and Ignacy Jan Paderewski received their education. In late 19th century an additional story was added and in 1913 a new, much larger seat for the Institute was built adjacent to the palace.
Destroyed by the Germans in the effect of the Warsaw Uprising of 1944, the building had been rebuilt by Mieczysław Kuzma between 1949 and 1954, while the ruins of the 1913 construction were demolished.
The Fryderyk Chopin Museum at the Fryderyk Chopin Society in Warsaw was established in the 1930s. At that time, thirteen valuable manuscripts were purchased from Ludwika Ciechomska, granddaughter of Ludwika Jędrzejewicz, Chopin's sister, and Bogusław Kraszewski. The creation of a Collection of Photographs, Recordings and a Library was started prior to 1939.
In 1945, the Fryderyk Chopin Institute opened again in Warsaw, and was housed at first in Zgoda Street and from 1953 in Ostrogski Castle. This was also the home of the Museum, Library and Collections of Photographs and Recordings. The museum covers the history and works Chopin, including original manuscripts and documents written by the composer, photographs and sculptures of him, letters, as well as hosting piano recitals and competitions of Chopin's works. The rich plafonds, stucco and Pompeian style frescoes are a fitting setting for the rooms of the Fryderyk Chopin 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.