Aulus, Varis, the lorebooks, and the Garlean partisans in the fandom have pointed to the inability of pureblooded Garleans to manipulate aether as the causus belli for Imperial aggression: the Garleans are just defending themselves or getting revenge for being forced into the inhospitable northern reaches of Ilsaberd by the magically-inclined races. The implication seems to be that happened recently. Do we know where the Garleans were originally, when they were forced north, and who drove them out of the more habitable areas?