The State Russian Museum (formerly the Russian Museum of His Imperial Majesty Alexander III) is the largest depository of Russian fine art in St Petersburg. The museum was established in 1895, upon enthronement of Nicholas II to commemorate his father, Alexander III. Its original collection was composed of artworks taken from the Hermitage Museum, Alexander Palace, and the Imperial Academy of Arts. After the Russian Revolution of 1917, many private collections were nationalized and relocated to the Russian Museum. These included Kazimir Malevich's Black Square.
The main building of the museum is the Mikhailovsky Palace, a splendid Neoclassical residence of Grand Duke Michael Pavlovich, erected in 1819-25 to a design by Carlo Rossi on Square of Arts in St Petersburg. Upon the death of the Grand Duke the residence was named after his wife as the Palace of the Grand Duchess Elena Pavlovna, and became famous for its many theatrical presentations and balls.
Some of the halls of the palace retain the Italianate opulent interiors of the former imperial residence. Other buildings assigned to the Russian museum include the Summer Palace of Peter I (1710–14), the Marble Palace of Count Orlov (1768–85), St Michael's Castle of Emperor Paul (1797–1801), and the Rastrelliesque Stroganov Palace on the Nevsky Prospekt (1752–54).
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.