The Kassari Manor, also called Saaremõisa (’Island Manor’), was founded in this location by David Johan Gaertner, the archivist of the Est- land Supreme Land Court, in 1730s. In 1758, the Stackelbergs became its new owners. That Baltic German family took care of and managed the Kassari Manor until the beginning of the 20th century.
One of the buildings that once belonged to the old manor and that have survived is the stone-built steward’s house, which later housed a school, a library and a post office and is now one of the sites of the Hiiumaa Museum. Other buildings surviving from the manor are the stone-built stable, the gardener’s house, granary and the big Dutch-style windmill. Here and there, one can also spot the remnants of the limestone wall, once surrounding the manor centre, as well as the foundations of some buildings.
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.