The monograph studied lead seals from the times of Kievan Rus, which sealed the bundles of squirrel skins that became money as a result of this operation. According to the signs on the seals, a list of great Kyiv princes and individuals, church services and bodies of the princely administration, to whom the princes granted the right to brand fur money, is established. The appendix publishes the seals of the Smolensk principality and the famous Galician rogue prince Ivan Berladnik.