Jelling, Denmark
10th century
Västerås, Sweden
1500 BC - 1000 AD
Vallentuna, Sweden
c. 1190
Frösön, Sweden
1030-1050
Drottningholm, Sweden
12th century
Ödeshög, Sweden
800 AD
Vallentuna, Sweden
12th century
Vallentuna, Sweden
1280s
Uppsala, Sweden
11th century
Kristinehamn, Sweden
500 AD
Nyköping, Sweden
11th century
Sparlösa, Sweden
c. 800 AD
Högom, Sweden
500 AD
Hedehusene, Denmark
700-800 AD
Uppsala, Sweden
11th century
Mörbylånga, Öland, Sweden
ca. 950-1000 AD
Ronneby, Sweden
500-700 AD
Jyllinge, Denmark
c. 730 AD
Norrköping, Sweden
13th century
Smøla, Norway
11th century
Kristiansten Fortress was built to protect the city against attack from the east. Construction was finished in 1685. General Johan Caspar von Cicignon, who was chief inspector of kuks fortifications, was responsible for the new town plan of Trondheim after the great fire of 18 April 1681. He also made the plans for the construction of Kristiansten Fortress.
The fortress was built during the period from 1682 to 1684 and strengthened to a complete defence fortification in 1691 by building an advanced post Kristiandsands bastion in the east and in 1695 with the now vanished Møllenberg skanse by the river Nidelven. These fortifications were encircled by a continuous palisade and thereby connected to the fortified city. In 1750 the fortress was modernized with new bastions and casemates to protect against mortar artillery.