Example image of eyePlorer eyePlorer map for 'Viterbo': Comune Italy Latium Province of Viterbo Cimini Hills Monti Volsini Via Cassia Tuscia University Annio da Viterbo Etruscan civilization Desiderius Lombards Franks Holy Roman Church Medieval commune Papal States Pope Eugene III Antipope Paschal III Frederick I, Holy Roman Emperor Pope Innocent III Otto IV, Holy Roman Emperor Frederick II, Holy Roman Emperor Guelphs and Ghibellines Siege of Viterbo Pope Alexander IV Pope Urban IV Conradin House of Hohenstaufen Palazzo dei Papi di Viterbo Pope Clement IV Swabia France Pope Gregory X Pope John XXI Pope Martin IV Pope Nicholas III Charles I of Naples Kingdom of Naples Papal conclave Amelia Bolsena Civitavecchia Giovanni di Vico Narni Orvieto Tarquinia Todi Avignon Gil Álvarez Carrillo de Albornoz Pope Urban VI
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