Fief of Viborg (1320–1534) was for some two centuries a late medieval fief in the southeastern border of Finland and the entire Swedish realm, held by its chatelain, a fiefed, appointed feudal lord. For extended periods the medieval commanders of Viborg castle (chatelains, castellans), on the border with republic of Novgorod, did in practice function as margraves, collecting the crown's incomes from the fief in their own name and being entitled to keep them all to use for the defense of the realm's eastern border. They enjoyed more independence than the kingdom's other castellans, "burgraves". 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 the 135