Christian V of Denmark
Construction of fortifications started in 1673 during the Gyldenløve War as "Hammersberg Skanse". It was renamed Christiansfjeld Fortress in 1685 by King Christian V of Denmark during his visit to Hammersberg Skanse on June 14. Although the fortress was manned through the Great Northern War, the city was spared major battles. In 1742, Christiansfjeld Fortress was closed.