Stones of Mora was the place where the Swedish kings were elected. The origin of the tradition is unknown, but it has been known since the 13th century and mentioned by Snorri Sturlason (died 1241). The first known document tells that Magnus Ladulås was elected at the Stones of Mora in 1275. Magnus IV was elected at the stones on July 8, 1319 and Kristian I in 1457. He was the last to be elected at the stones.
The Stone of Mora and many stones which flanked it with inscriptions commemorating the elections of earlier kings, were probably destroyed in 1515 during the civil war against the Danes. Gustav Vasa and John III are said to have tried to reconstruct the Stones of Mora without success.
One of the fragments is known as the stone Three Crowns since it is the earliest known example of the use of Sweden's national symbol. The fragment is what remains of the election of Albert of Mecklenburg.
The building where the fragments are contained today was constructed by Carl Wijnbladh in 1770.
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.