Château de Parthenay was built during the 13th century whose remains are still visible to this day. The castle was built on a rock by the side of the river. A citadel was built around the castle which was only accessible through the Saint Jacques gate. The gate and the city walls are still largely intact. There is another gate at the other side of the city, the Tour de l'Horloge gate. Both gates have characteristic almond-shaped towers. In total, the citadel has over 30 defensive towers, 4 entrance gates and a defensive wall with a length of over 1km.
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.