Carlsten is a stone fortress located at Marstrand, on the western coast of Sweden. Fortifications are Military Constructions and Buildings designed for defense in Warfare Humans have constructed defensive works for Marstrand is a seaside town in Kungälv Municipality, Västra Götaland County in western "Sverige" redirects here For other uses see Sweden (disambiguation and Sverige (disambiguation. The fortress was built on the orders of King Carl X of Sweden following the Treaty of Roskilde, 1658 to protect the newly acquired province of Bohuslän from hostile attacks. Charles X Gustav (Karl X Gustav (8 November 1622 – 13 February 1660 was King of Sweden from 1654 until his death The Treaty of Roskilde was signed on February 26, 1658 in the Danish city of Roskilde. is one of the 25 traditional non-administrative Provinces of Sweden ( landskap in Swedish situated on the west coast of the country
The site of Marstrand was chosen because of its location and its access to an ice free port. ||-||-|-||-||-||-||-||-||-|} A port is a facility for receiving Ships and transferring cargo Initially a square stone tower was constructed, but by 1680 it was reconstructed and replaced by a round shaped tower. Successive additions to the fortress were carried out, by the inmates sentenced to hard labour, until 1860 when it was reported finished. The fortress was decommissioned as a permanent defense installation in 1882, but remained in military use until the early 1990s.
The fortress was attacked and sieged twice falling into enemy hands. In 1677 it was conquered by Ulrik Frederick Gyldenløve, the Danish military commander in Norway and in 1719 by the Norwegian Admiral Tordenskjold. Ulrik Frederik Gyldenløve (1638-1704 was King Frederick III of Denmark 's illegitimate son who became a statesman and the leading Norwegian general in the Scanian War The Kingdom of Denmark ( ˈd̥ænmɑɡ̊ (archaic ˈd̥anmɑːɡ̊ commonly known as Denmark, is a country in the Scandinavian region of northern Europe Norway ( Norwegian: Norge ( Bokmål) or Noreg ( Nynorsk) officially the Kingdom of Norway, is a Constitutional Peter Jansen Wessel (alt spelling Peder) better known as Tordenskjold (lit At both occasions the fortress was returned to Swedish control through negotiations and treaties.