It is not exactly known when the Abbaye de Sainte-Trinité in Lessay was established; other historians date it to 1056, Cologne University to 1105. The vaults of the church, built around 1100 are however probably the oldest in Normandy. The abbey flourished in the 12th and 13th centuries, but during the Hundred Years' War in 1356 it was burned and looted. The nave and tower were badly damaged and restored in 1385. Lessay Abbey suffered again in the French Wars of Religion, when it was looted twice. Again in World War II the bombings of Normandy invansion in 1944 destroyed it partially and restoration took 12 years.
References:The abbey was not bombed in 1944 but was deliberately blown up by German land mines before the Germans retreated.
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.