The Third Swedish Crusade was a Swedish military expedition to Karelia in 1293, an area controlled by Novgorod. As the result of the attack, Viborg Castle was established and western Karelia remained under Swedish rule for over 400 years.
The name of the expedition is largely unhistorical, and it was just a part of a long series of military conflicts in the Swedish-Novgorodian Wars.
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The original article can be found at Third Swedish Crusade and the edit history here.