Landskron castle itself was probably built in the early 13th century. Is first mentioned in 1244. This castle was destroyed in 1257 and 1275 by the rebellion Oppenheim citizens. It was rebuilt in 1281.
The castle burned down in 1621 during the Thirty Years War. In the Nine Years War, French troops blew up the keep in 1689 to keep. In the following years the citizens used the ruins as a quarry.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.