Valdemars Castle was built by King Christian IV (1588–1648) between 1639 and 1644. It is designed by Hans van Stenwinkel. The king’s plans for his new castle were that the house should become the home for his son Valdemar Christian, who was born to him by Kirstine Munk. King Christian was renowned for his interest in building. On the island of Tåsinge, belonging to his mother in law Ellen Marsvin, the king decided to build a castle for his young son. However, Valdemar Christian never moved in. He was killed in battle in Poland in 1656.
In 1678 the naval hero, Admiral Niels Juel, was given title to the castle and the land on Tåsinge after his victory over Sweden in the Battle of Køge Bay in 1677. The estate was transferred to him as payment for the Swedish ships captured in the battle.
The present owner, Baron Iuel-Brockdorff, who is 11th generation of the Juel family, took over his childhood home from his father in 1971 and lives in the castle with his wife and family. Valdemars Slot has been open to the public since 1974. The castle is open from May to October and on public holidays. The castle features a large chapel, a toy museum, the Iuel-Brockdorff family's big game trophy collection and a local maritime museum. As the castle lies near the beach, it is popular for visitors to come by ferry on the Helge from Svendborg.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.