Rhuddlan Castle was erected by Edward I in 1277, following the First Welsh War. The castle was completed prior to the rebellion of Llywelyn the Last in 1282. The remains of older Norman castle at Twthill, built in 1086, is just to the south of the current castle.
In 1294 the castle was attacked during the Welsh rising but was not taken. It was attacked again in the by forces of Owain Glyndŵr in 1400. This time the town was badly damaged but the castle held out. In the latter 15th and early 16th centuries the castle's condition deteriorated as its strategic and administrative importance waned.
Rhuddlan Castle was again garrisoned by Royalist troops during the English Civil War, and remained a stronghold of King Charles I of England until well after the Battle of Naseby, being taken by Parliamentary forces under Thomas Mytton after a siege in 1646. Two years later, Parliamentarians partially demolished the castle to prevent any further military use. By the time Pennant passed through in 1781, it was largely ruined.
Rhuddlan was planned as a concentric castle. It has a unique 'diamond' in layout as the gatehouses are positioned at the corners of the square baileys instead of along the sides like at Flint, Harlech or Beaumaris. Records of construction costs show that it was the major piece of building work being carried out by the English during the late 1270s.
The inner ward has defensive walls with twin-tower gatehouses. The outer ward is surrounded by a curtain wall that has small towers and turrets. The castle had a three-sided moat, with the River Clwyd protecting its fourth side. Within the inner ward there was a great hall, kitchens, private apartments and a chapel. The outer bailey had a granary, stables and a smithy.
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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.