Tiburtine Sibyl
To the classical sibyls of the Greeks, the Romans added a tenth, the Tiburtine Sibyl, whose seat was the ancient Sabino-Latin town of Tibur (modern Tivoli). The mythic meeting of Augustus with the Sibyl, of whom he inquired whether he should be worshiped as a god, was a favored motif of Christian artists. Whether the sibyl in question was the Etruscan Sibyl of Tibur or the Greek Sibyl of Cumae is not always clear. The Christian author Lactantius had no hesitation in identifying the sibyl in question as the Tiburtine sibyl, nevertheless. He gave a circumstantial account of the pagan sibyls that is useful mostly as a guide to their identifications, as seen by 4th century Christians:
The Tiburtine Sibyl, by name Albunea, is worshiped at Tibur as a goddess, near the banks of the Anio, in which stream her image is said to have been found, holding a book in her hand. Her oracular responses the Senate transferred into the capitol. (Divine Institutes I.vi)
An apocalyptic pseudo-prophecy exists, attributed to the Tiburtine Sibyl, written c. 380 CE, but with revisions and interpolations added at later dates. It purports to prophesy the advent of a final Emperor named Constans, vanquishing the foes of Christianity, bringing about a period of great wealth and peace, ending paganism and converting the Jews. After vanquishing Gog and Magog, the Emperor is said to resign his crown to God. This would give way to the Antichrist. Ippolito d'Este rebuilt the Villa d'Este at Tibur, the modern Tivoli, from 1550 onward, and commissioned elaborate fresco murals in the Villa that celebrate the Tiburtine Sibyl, as prophesying the birth of Christ to the classical world.
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