The Église Saint-Polycarpe (Church of St. Polycarp) is the oldest church of the Oratory of Saint Philip Neri. The church, built by the Oratorians installed on the slopes, was completed in 1670, with the exception of the façade that was built in 1756 by architect Toussaint Loyer who also lengthened the nave.
On 19 June 1791, the Oratory Church became a parish church and took the name of St. Polycarp, as a tribute to Polycarp of Smyrna, master of Saint Pothinus and Irenaeus, who were the first two bishops of Lyon. The church has a famous organ, built by Augustine Zeiger in 1841.
The church has a facade decorated with four Corinthian pilasters topped by a triangular pediment. Louis Janmot made the painting depicting the Last Supper which is placed in the apse.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.