The moat and round tower of Pencoed Castle may date from 1270 by Sir Richard de la More. It passed to the Morgans of Tredegar in the 15th century and a big new mansion on the east side and the gatehouse on the west side were built by Sir Thomas Morgan in c. 1490-1500. The gatehouse and corner tower are ruined and the mansion lies in a gutted and derelict state, though still with some flooring and the roof more or less intact.
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.