D&D 3.0: Tales from Mystara
Prince Étienne d'Ambreville
Prince Etienne d’Amberville was the most powerful wizard Averoigne had ever known. Unfortunately for him, Averoigne was not a place that appreciated wizardry. All forms of magic were outlawed, and magic-users were hunted down and killed. After years of study, Etienne discovered a way to create a magic portal from Averoigne to another plane. In AC 728, Etienne led his vassals through the portal to the Principalities of Glantri on Mystara, where they founded the Principality of New Averoigne. Later they would use the portal again to bring more refugees through, as well as giving House Crownguard use of the portal.