The Supreme Council of sorcerers consisted of talented mages, most of whom also were advisors to rulers of Northern kingdoms. Philippa Eilhart and Carduin of Lan Exeter were, among others, it's members. Though only one member of the Council turned out to be a Nilfgaardian supporter during the Thanedd rebellion, a large part of it's members were neutral mages, and that caused a split in the body. Though most of the Council's members survived those events, the loss of importance and the kings' support resulted in disbanding the association, and sorcerers lost most of their previous influence in the North.