At the beginning of "The Marvelous Land of Oz", it is revealed that the Good Witch of the North had banned the practice of magic by any other witch in Gillikin Country (thereby minimizing potential future threats). The Gillikin Country had once been under the power of Mombi, but she was overpowered and routed by the Good Witch of the North, as revealed in "Dorothy and the Wizard in Oz". Thus, the Wicked Witch of the North was forced to be no more than a lowly wizardess, under the Good Witch of the North's rule.