"Giovanni di Vico (died 1366) was an Italian Ghibelline leader, lord of Viterbo, Vetralla, Orvieto, Narni and numerous other lands in northern Lazio and Umbria. He is the most famous member of the Prefetti di Vico family."@en . "Giovanni di Vico (died 1366) was an Italian Ghibelline leader, lord of Viterbo, Vetralla, Orvieto, Narni and numerous other lands in northern Lazio and Umbria. He is the most famous member of the Prefetti di Vico family."@en . . . . . . "Giovanni di Vico"@en .