There may have been two or three wooden churches in Kökar since the last half of 14th century. During the 16th century a Franciscan monastery was founded on Hamnö island. This place became a spiritual and cultural centre for the entire archipelago.
Today the ruins of monastery share their site with current Kökar's church, which is probably third in this place. It was built between 1769 and 1784 in charge of Antti Piimänen (he died before church was completed). Stones of previous monasteries were used in the construction. In the chapel beside the church are archaeological excavations on Hamnö.
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.