Gjellerup Church, built in the 12th century, is unique for its Latin inscription in the tympanon above former door facing to the south. The inscription, carved in 1140, makes Gjellerup Church the oldest dated building in Denmark. The church is consecrated to the Roman martyr St. Laurentius. There are traces of a Romanesque tower, and the sheer size of the church is remarkable. The oldest parts are the chancel and nave. The southern nave was added around 1540, the porch oin 1650 and current tower in 1784.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.