Welsberg Castle (Castel Monguelfo in Italian) lies in a strategic position above Casies Valley. The castle was built in 1140 by the two brother Schwinkher and Otto von Welsberg. This latest wanted the overhanging upon his lands. For more than 800 years the castle had been property of the von Welsbergs, one of the mightiest families in Tyrol, who obtained the title of Prince of the Holy Roman Empire in 1693 by the emperor Leopold I.
The construction can be divided into two main periods: the first Romanesque one in the XII century, and the second one, in the gothic and Renaissance period in the XVI century. The oldest element of the castle is the tall defensive tower built between 1126 and 1140. Around it the old Romanesque chapel, the residential building, and the other buildings had been built.
In 1765 the castle was destroyed by a fire and the upper floor had to be broken up and the roof brought down to the present height. Since then the castle had been forgotten till recent times when the heir of the Welspergs entrusted it to the Kuratorium Committee which completely restored it and made visits available during summer season.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.