From construction to ruin . Construction of the Kajaani castle was started by Clemens Eriksson by order from king
Charles IX of Sweden in 1604. The small islet that was chosen for the foundation proved to be far too small to support a castle, so it was enlarged by
piling and
embankment. The original walls of the castle rose up directly from the rapids. Upon completion, the Kajaani Castle became the northernmost stone castle in Europe. There was discussion in the late 20th century about whether there had previously been any castle or other building at the site before the 17th century. An argument towards the view that there had been previous buildings was that the location was strategically important. There has been no evidence of prior buildings, and so the researcher Heikki Rytkölä from the
Museum of Kainuu thinks of the view that there had been prior buildings as too daring. The castle was constructed on an island on the rapids of the
Kajaani River to the east of lake
Oulujärvi. In 1606 the king gave an order to admiral
Isak Behm that the castle should be surrounded by a wall. A The castle had to be able to defend itself against any possible siege, and because of that king Charles IX appointed the master builder Isak Rasmusson and two
journeymen to oversee its construction. At first, the castle only consisted of a stone wall, two round towers, and wooden buildings in the yard inside the castle. All buildings inside the castle walls were made of wood. After all construction had been stopped, Erich Hare resigned from his post as the castle commander a professor at the
Uppsala University, sentenced to prison because of his contact with the
Jesuits and the
Pope, who was forced to live in the poor conditions of the castle from 1616 to 1635, The Kajaani Castle remained as the main building of the Kajaani
Freiherrdom until 1681, when the fiefdom was discontinued during the
Great Reduction. The castle once again became a castle for the
fogd, whose responsibilities included defence of the area. The old wooden bridge became too narrow and weak for the growing car traffic in the early 20th century. By initiative of the City of Kajaani, a new restoration project took place from 2001 to 2008. During the project, the
Finnish Heritage Agency repaired the walls and researched its construction history, and the city built a new pedestrian bridge to the island. New road signs were made to improve the accessibility and tourism, and a restoration report and website were made. In 2014 the Kajaani Castle went under the care of the nature services of the
Metsähallitus agency of forestry along with 28 other valuable cultural heritage sites. == Architecture ==