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.
The Danes would then be attacked on three sides: Sten Sture would attack from the south, Nils Sture would flank the Danes and attack from the rear, and Posse would attack the Danes from the east flank near St. Klara.
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Important personages who held Viipuri county as their fief, were Bo Jonsson Grip, Krister Nilsson Vasa (1417–42), Charles Knutsson Bonde (1442–48, the future king), Erik Axelsson Tott (1457–81), Knut Posse (1495–97), Sten Sture the Elder (particularly 1497-99 when personally in residence, between his regencies), Eric Bielke and count John of Hoya.