Björksund Castle is a castle-like manor house in Sweden. Björksund located on Sibbofjärden, northeast of Nyköping in Södermanland County. The estate first belonged to the Grip family, but came in the late Middle Ages through marriage to the Privy Councilor Göran Eriksson Gyllenstierna (1498-1575) of Fågelvik. The estate remained in his family until 1776, when it partly passed by purchase to Count Carl Gabriel Mörner (1737-1828), heir to the Privy Council member and Marshal of the Realm Göran Gyllenstierna (1724–1799).
The manor house was built in Baroque style during 1727. It was designed by French-Swedish architect Joseph Gabriel Destain (died in 1740). Additions in the 1740s were by Baron Carl Hårleman (1700–1753).
The estate covers 4,700 hectares (12,000 acres) and large areas of the archipelago. Björksund Förvaltnings AB also manages a number of properties in Nyköping.
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The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.