Roskilde Mansion replaced a bishop's palace which had stood at the site since the Middle Ages. Commissioned by King Christian VI, the new building was constructed to provide a residence for the royal family when they passed through the city or attended royal funerals and other ceremonies in Roskilde Cathedral. Lauritz de Thurah who had recently been engaged as royal master builder, was charged with its design in 1733 and the palace was completed in 1736.
During the English siege of Copenhagen in 1807, the mansion served as headquarters of general Wellesley, the future Duke of Wellington. Later in the century, it provided a venue for the so-called Assembly of the Estates, a key event leading up to the adoption of the Danish constitution in 1849.
Built in the Baroque style, in yellow-washed masonry and with red tile roofs, the four-winged complex consists of a two-storey main wing, two one-storey lateral wings and a curved gate wing opening to the Stændertorvet. The four wings are connected by curving galleries. Facing the courtyard, the facade of the main wing has pilasters and a median risalit tipped by a triangular pediment decorated with the royal coat of arms. Dating from the 13th century, the Gate of Absalon which connects the mansion to the apsis of Roskilde Cathedral, is the only surviving part of the former bishop's palace.
Since 1924, one of the wings has been home to the office and official residence of the Bishop of Roskilde. The rest of the complex houses Roskilde Museum of Contemporary Art, founded in 1991, as well as Roskilde Art Association and the Palace Collections. The mansion's gardens and courtyard are also used for exhibitions, concerts and other cultural events.References:
Ängsö Castle was first named as "Engsev" in a royal charter by king Canute I of Sweden (r. 1167-1196), in which he stated that he had inherited the property after his father Eric IX of Sweden. Until 1272, it was owned by the Riseberga Abbey, and then taken over by Gregers Birgersson.
From 1475 until 1710, it was owned by the Sparre family. The current castle was built as a fortress by riksråd Bengt Fadersson Sparre in the 1480s. In 1522, Ängsö Castle was taken after a siege by king Gustav Vasa, since its owner, Fadersson's son Knut Bengtsson, sided with Christian II of Denmark. However, in 1538 it was given by the king to Bengtsson's daughter Hillevi Knutsdotter, who was married to Arvid Trolle.
In 1710, the castle was taken over by Carl Piper and Christina Piper. Ängsö Castle was owned by the Piper family from 1710 until 1971, and is now owned by the Westmanna foundation. The castle building itself was made into a museum in 1959 and was made a listed building in 1965. It is currently opened to visitors during the summers.
The castle is a cubical building in four stores made by stone and bricks. The lower parts is preserved from the middle ages. It was redecorated and expanded in the 1630s. The 4th storey as well as the roof is from the expansion of Carl Hårleman from 1740-41. It gained its current appearance in the 1740s.