Rumored to be in the Northern Hinterlands.
Sulyott confirms that it was held in Ogenheim, Kiridin, Northern Hinterlands, one of the barbarian lands. Was possessed at that time by Nightcloud, one of the 3 so-called furies.
See the log Civil War, Barbarians, and Other News for the initial report. It was sent by Minischmee while he was King of Bizantium.