The Abbey of St. Vaast was founded in 667. Saint Vedast, or Vaast (c. 453–540) was the first bishop of Arras and later also bishop of Cambrai, and was buried in the old cathedral at Arras. In 667 Saint Auburt, seventh bishop of Arras, began to build an abbey for Benedictine monks on the site of a little chapel which Saint Vedast had erected in honour of Saint Peter. Vedast's relics were transferred to the new abbey, which was completed by Auburt's successor and generously endowed by King Theuderic III, who together with his wife was afterwards buried there.
The Abbey of St. Vaast was of great importance amongst the monasteries of the Low Countries. It was exempt from episcopal jurisdiction and maintained its independence until 1778, when it was aggregated to the Congregation of Cluny.
At the French Revolution it was suppressed and the monastic buildings were used first as a hospital and then as barracks. In 1838 the premises were purchased by the town; part was used as a museum and archive, and the rest as the residence of the bishop. The abbey church, which had been desecrated and partially destroyed, was rebuilt and consecrated in 1833 and now serves as the cathedral of Arras, substituting for the former Gothic cathedral destroyed during the Revolution. The abbey houses the Musée des beaux-arts d'Arras.
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.