Basmo fortress was constructed in the 1680s and was abandoned after 62 years of service in 1745. The first mention of this Norwegian fortress is in a letter from Field Marshal Wedel Jarlsberg to the King in 1683. Major General Johan Caspar von Cicignon developed the plans.
During the Great Northern War it was manned by up to 1,350 men. On the night of March 9, 1716, the pyres on the mountaintops announced Swedish King Charles XII and 1,000 men had crossed the border. Moving rapidly, he found the border poorly guarded and moved with cavalry to Høland parsonage. Norwegian troops stationed in the district were assembled by the Basmo commander, Colonel Kruse, who attacked the Swedes in a bloody battle. Charles XII barely escaped capture, but the tide was soon turned against the outnumbered Norwegians, and Kruse, badly wounded, was captured. The Swedes went on to occupy Christiania without resistance on March 21, 1716, but were ultimately repulsed. Basmo was also in the path of invading Swedish troops during Charles XII’s second unsuccessful invasion in 1718.
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.