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In the Russo-Swedish War (1495–1497) Ivan III unsuccessfully attempted to conquer Viborg from Sweden but this attempt was checked by the Swedish garrison in Viborg Castle led by Lord Knut Posse.
However the fief of Viborg castle and its county, was not formally hereditary, though almost all appointees were from certain families, related to the Bonde-Bååt-Haak family that also between 1350s and 1390s held the Swedish titular version of the earldom of Orkney.