Without the popes, the city fell into the hands of the Di Vicos. In the fourteenth century, Giovanni di Vico had created a seignory extending to Civitavecchia, Tarquinia, Bolsena, Orvieto, Todi, Narni and Amelia. His dominion was crushed by Cardinal Gil de Albornoz in 1354, sent by the Avignonese popes to recover the Papal States, who built the castle. In 1375, the city gave its keys to Francesco Di Vico, son of the previous tyrant, but thirteen years later the people killed him and assigned the city first to Pope Urban VI, and then to Giovanni di Sciarra di Vico, Francesco's cousin. But Pope Boniface IX's troops drove him away in 1396 and established a firm papal suzerainty over the city. The last Di Vico to hold power in Viterbo was Giacomo, who was defeated in 1431.
Without the popes, the city fell into the hands of the Di Vicos. In the fourteenth century, Giovanni di Vico had created a seignory extending to Civitavecchia, Tarquinia, Bolsena, Orvieto, Todi, Narni and Amelia. His dominion was crushed by Cardinal Gil de Albornoz in 1354, sent by the Avignonese popes to recover the Papal States, who built the castle. In 1375, the city gave its keys to Francesco Di Vico, son of the previous tyrant, but thirteen years later the people killed him and assigned the city first to Pope Urban VI, and then to Giovanni di Sciarra di Vico, Francesco's cousin. But Pope Boniface IX's troops drove him away in 1396 and established a firm papal suzerainty over the city. The last Di Vico to hold power in Viterbo was Giacomo, who was defeated in 1431.