There has been an ironworks in Jädersbruk since Middle Ages. It was originally owned by Julita Abbey. After Reformation Jädersbruk was confiscated to the Crown. King Gustav Vasa set up there the first arms manufactory “Arboga faktori, Jäders Bruk” to decrease the dependence of foreign weapons.
Weapons fere forged until the end of 17th century when the ironworks gradually started manufacturing of civilian products. The ironworks flourished until the early 20th century. Today the manor house and workers’ cottages remain and there are art and handicraft workshops.
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.