History of Finland between 500 BC - 1149
The Iron Age in Finland is considered to last from c.500 BC until c.1150 AD when the Swedish Conquest of Finland was complete and written history in Finland (the Middle Ages) begins. There is no evidence of any form of writing in Finland, runes or otherwise, prior to the Swedish Conquest and all evidence regarding Finnish history prior to Swedish involvement is based on archaeological findings and the scant records of contemporaneous third parties. The three main dialectal groups of Finnish-speakers, (proper-)Finns, Tavastians and Karelians probably emerged during the Iron Age. The archaeological culture of the Åland Islands had a more prominent Swedish character than the rest of the country, possibly suggesting Scandinavian settlement.
The earliest findings of imported iron blades and local iron working appear in 500 BC. From about 50 AD, there are indications of a more intense long-distance exchange of goods in coastal Finland. Inhabitants exchanged their products, presumably, mostly furs, for weapons and ornaments with the Balts and the Scandinavians as well as with the peoples along the traditional eastern trade routes. The existence of richly furnished burials, usually with weapons, suggests that there was a chiefly elite in southern and western parts of the country. Hillforts spread over most of southern Finland at the end of the Iron and early Medieval Age. There is no commonly accepted evidence of early state formations in Finland, and the presumedly Iron Age origins of urbanisation are contested.
In the early Iron Age a word similar to Finns appeared for the first time in a written document when Tacitus mentions Fenni in his Germania. However, it is unclear if these have anything to do with the present Finnish people. The first Scandinavian documents mentioning a "land of the Finns" are two runestones: (Söderby, Sweden, with the inscription finlont (U 582 †), Gotland with the inscription finlandi (G 319 M) dating from the 11th century.
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.