What is "blotstulka"

Blotstulka, or Blot-Tulca, (11th century ) is a name known in legend for an alleged Swedish medieval queen consort, spouse of a King " Blot-Sweyn" of Sweden who may have reigned in the 1080s. The name can be seen as the equivalent to that of her spouse, with the meaning: "The woman Sacrificer" or "The Maiden Sacrificer"; as her spouse's name was "Sweyn the Sacrificer", which can also be translated as "The man who performs the sacrifices".