Weber, Hans (1900). Der Kampf zwischen Papst Innocenz IV. und Kaiser Friedrich II, bis zur Flucht des Papstes nach Lyon (Berlin: E. Ebering 1900). Wolter, L. and H. Holstein (1966), Lyon I et Lyon II (Paris 1966). External links 1190s births 1254 deaths Clergy from Genoa Italian popes University of Parma alumni University of Bologna alumni Bishops of Albenga Christians of the Prussian Crusade Christians of the Second Swedish Crusade Popes 13th-century popes Fieschi family