Born into a cadet branch of the family, he contested the seigniory of Ferrara to the young Niccolò III, an illegitimate son of marquess Alberto d'Este who was under the protection of Pope Benedict IX and Venice.
Pope John Paul II | Pope Benedict XVI | Pope | Pope Paul VI | Alexander Pope | Pope Pius IX | Pope Pius XII | Pope Francis | Pope Leo XIII | Pope Pius XI | Pope John XXIII | Order of Saint Benedict | Pope Innocent IV | Pope Pius VII | Benedict Arnold | Pope Pius X | Pope John Paul I | Pope Alexander III | Pope Clement VII | Pope Urban VIII | Pope Clement V | Pope Pius VI | Pope Julius II | Pope Gregory VII | Pope Clement VIII | pope | Pope Sixtus V | Pope Alexander VI | Pope Benedict XIV | Pope Benedict XV |