Kajaani Castle
castle in Kajaani, Finland
The Kajaani Castle (Finnish: Kajaanin linna, Swedish: Kajaneborg, Kajaneborgs slott, older spelling Cajanaborg) is a ruined fortress built of granite in Kajaani. The castle was built in the early 17th century on an islet in the river Kajaaninjoki, between the Ämmäkoski and Koivukoski rapids in Kainuu, present-day Finland. It was the last medieval-style stone castle constructed in Sweden.
The castle was built at a strategically valuable site to protect the region of Kainuu which had been ceded to Sweden in the Treaty of Teusina in 1595. Construction was started by king Charles IX of Sweden in 1604. Construction progressed slowly, and king Gustav II Adolf ordered its interruption in 1619. The incomplete castle was first used as a prison.
The castle experienced its peak during the tenure of Count Per Brahe the Younger from 1650s to 1670s. The town of Kajaani was founded in 1651 next to the castle, and plans were made to transform the castle into a noble residence. However, in 1681, the fief was abolished during the Great Reduction, and the castle reverted to serving as a simple administrative center for Sweden's northernmost territories.
This brief starts where responsible research should: with the source description of “Kajaani Castle” as castle in Kajaani, Finland. Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the places & architecture register because the source frames it as castle in Kajaani, Finland. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Maps, plans, fabric surveys and administrative records can establish how the site’s name, extent and function changed over time. The source revision retrieved here is dated Aug 7, 2026. The linked authority identifier is Q2628629. Authority coordinates are 64.229, 27.733. 2 of 2 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1595, 1604, 1619 and 1651.
Architectural summaries often privilege surviving fabric and can understate demolished phases, contested use or displaced communities. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
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Three-step research path
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This entry incorporates text from “Kajaani Castle” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.