Bergkvara Castle had originally five floors and four corner towers. It was probably built by Arvid Trolle around 1470-1480. It was owned by his family 150 years and played an important part as a political and economical power centre. Nils Dacke, the leader of the famous peasant revolt, besieged the castle in 1542 and then attacked and burned it to the ground. The castle was left to decay until in 1794 count Arvid Eric Posse build a new main building next to the old ruins.References:
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.