Östra Ryd Church was built around the year 1300 and the nave and vaults were constructed around 1430. The church was rebuilt completely in the 1700s, when the tower was added. The altar screen is made of oak in 1488. The limestone font dates from the mid-1200s and wooden cruficixes from the 1400s. There is also a chapel of Brahe family, added in 1690-1693. They donated lot of valuable inventory to Östra Ryd church, most of them were war trophies from the Thirty Years' War.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.