First Council of Lyons

The First Council of Lyons (Lyons I) was the Thirteenth Ecumenical Council and took place in 1245.

The First General Council of Lyons was presided over by Innocent IV. The Patriarchs of Constantinople, Antioch, and Aquileia (Venice), 140 bishops, Baldwin II, Emperor of the East, and St. Louis, King of France participiated. It excommunicated and deposed Emperor Frederick II and directed a new crusade, under the command of St. Louis, against the Saracens and Mongols.