The mythic meeting of Cæsar Augustus with the Sibyl, of whom he inquired whether he should be worshiped as a god, was often depicted by artists from the late Middle Ages onwards. In the versions known to the later Middle Ages, for example the account in the Golden Legend, Augustus asked the Sibyl whether he should be worshipped as a god, as the Roman Senate had ordered. She replied by showing him a vision of a young woman with a baby boy, high in the sky, while a voice from the heavens said "This is the virgin who shall conceive the saviour of the world", who would eclipse all the Roman gods. The episode was regarded as a prefiguration of the Biblical Magi's visit to the new-born Jesus and connected Ancient and Christian Rome, implying foreknowledge of the coming of Christ by the greatest of Roman emperors.
Whether the sibyl in question was the Etruscan Sibyl of Tibur or the Greek Sibyl of Cumæ is not always clear. The Christian author Lactantius identified the sibyl in question as the Tiburtine sibyl. 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 prophecy of the Tiburtine SibylEdit
An apocalyptic pseudo-prophecy exists among the Sibylline Oracles, which was attributed to the Tiburtine Sibyl. Its earliest version may date from the fourth century, but in the form that it survives today it was written in the early eleventh century, and has been influenced by the Apocalypse of Pseudo-Methodius. Its first version in Latin dates from the tenth century and may have come from Lombardy, though it was quickly picked up (and rewritten) by the Salian dynasty and the Hohenstaufens. It proved a useful rhetorical tool, valuable for many a ruler; the lists it contained of emperors and kings were revised to fit the circumstances, and hundreds of versions remain from the Middle Ages.
Its conclusion purports to prophesy the advent in the world's ninth age of a final Emperor vanquishing the foes of Christianity (heavily dependent on the Apocalypse of Pseudo-Methodius):
Then will arise a king of the Greeks whose name is Constans. He will be king of the Romans and the Greeks. He will be tall of stature, of handsome appearance with shining face, and well put together in all parts of his body...
This Emperor's reign is characterized by great wealth, victory over the foes of Christianity, an end of paganism and the conversion of the Jews. The Emperor having vanquished Gog and Magog,
After this he will come to Jerusalem, and having put off the diadem from his head and laid aside the whole imperial garb, he will hand over the empire of the Christians to God the Father and to Jesus Christ his Son.
In doing so, he will give way to the Antichrist:
At that time the Prince of Iniquity who will be called Antichrist will arise from the tribe of Dan. He will be the Son of Perdition, the head of pride, the master of error, the fullness of malice who will overturn the world and do wonders and great signs through dissimulation. He will delude many by magic art so that fire will seem to come down from heaven. ... When the Roman Empire shall have ceased, then the Antichrist will be openly revealed and will sit in the House of the Lord in Jerusalem.
The prophecy relates that Antichrist would be opposed by the Two Witnesses from the Book of Revelation, identified with Elijah and Enoch; after having killed the witnesses and started a final persecution of the Christians,
Frescoes at the Villa d'EsteEdit
Ippolito II 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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- Arianna Pascucci, L'iconografia medievale della Sibilla Tiburtina, Tivoli, 2011 
- Hall, 282; Murrays, 41
- "The Tiburtine Sibyl Showing the Virgin and Child to Augustus | RISD Museum".
- C. Bonura, ‘When Did the Legend of the Last Emperor Originate? A New Look at the Textual Relationship between the Apocalypse of Pseudo-Methodius and the Tiburtine Sibyl’, Viator 47, 3 (2016), 47-100. The text is edited in E. Sackur, Sibyllinische Texte und Forschungen (Halle, 1898) p 177ff; "it stands apart from the remaining Sibylline literature in holding that there is a total of nine ages, and although it draws upon ideas of considerable antiquity and apparently possesses a core dating from the fourth century A.D., much of its material is medieval." M. J. McGann, "Juvenal's Ninth Age (13, 28ff.)" Hermes 96.3 (1968:509-514) p.513 note 2.
- Latowsky, Anne A. (2013). Emperor of the World: Charlemagne and the Construction of Imperial Authority, 800–1229. Cornell UP. p. 70. ISBN 9780801451485.
- Hall, James, Hall's Dictionary of Subjects and Symbols in Art, 1996 (2nd edn.), John Murray, ISBN 0719541476
- Murray, Peter and Linda, revised Tom Devonshire Jones, The Oxford Dictionary of Christian Art & Architecture, 2014, Oxford University Press, ISBN 9780199695102, 0199695105
- Reyniers, Jeroen, 'The Iconography of Emperor Augustus with the Tiburtine Sibyl in the Low Countries. An Overview', in: M. Cavalieri, D. Engels, P. Assenmaker, M. Cavagna (ed.), Augustus Through the Ages: Receptions, Readings and Appropriations of the Historical Figure of the First Roman Emperor, Collection Latomus, Brussels, 2021.
- The Pseudo-Tiburtine prophecy, dated ca 380, with additions (e-text)
- Review of the book Nel segno della Sibilla Tiburtina