Grosmont Castle is a ruined castle in the village of Grosmont. The fortification was established by the Normans in the wake of the invasion of England in 1066, to protect the route from Wales to Hereford. Possibly commissioned by William fitz Osbern, the Earl of Hereford, it was originally an earthwork design with timber defences. In 1135, a major Welsh revolt took place, and in response King Stephen brought together Grosmont Castle and its sister fortifications of Skenfrith and White Castle to form a lordship known as the 'Three Castles', which continued to play a role in defending the region from Welsh attack for several centuries.
King John gave the castle to a powerful royal official, Hubert de Burgh, in 1201. During the course of the next few decades it passed back and forth between several owners, including Hubert, the rival de Braose family, and the Crown. Hubert rebuilt the castle in stone, beginning with a new hall and then, on regaining the property in 1219, adding a curtain wall, gatehouse and mural towers. In 1233, a royal army camped outside the castle was attacked by rebel forces under the command of Richard Marshall. Edmund, the Earl of Lancaster, gained possession of the castle in 1267, and it remained in the hands of the earldom and later duchy of Lancaster until 1825.
Edward I's conquest of Wales in 1282 removed much of Grosmont Castle's military utility, although it was besieged in 1405 during the Glyndŵr Rising. By the 16th century it had fallen into disuse and ruin. The castle was placed into the care of the state in 1922, and is now managed by the Cadw Welsh heritage agency.
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.