The word Sibyl comes (via Latin) from the ancient Greek word sibylla, meaning prophetess. Sibyls would give answers whose value depended upon good questions — unlike prophets, who typically answered with responses indirectly related to questions asked.
Presumably there was more than one sibyl at Erythrae. One is recorded as having been named Herophile,. At least one is said to have been from Chaldea, a nation in the southern portion of Babylonia, being the daughter of Berossus (who wrote the Chaldean history) and Erymanthe. Apollodorus of Erythrae, however, says that one who was his own countrywoman predicted the Trojan War and prophesied to the Greeks both that Troy would be destroyed and that Homer would write falsehoods.
The word acrostic was first applied to the prophecies of the Erythraean Sibyl, which were written on leaves and arranged so that the initial letters of the leaves always formed a word.
In Christian iconography the Erythraean Sibyl is credited with prophesying the coming of the Redeemer, which prophesy was in the form of an acrostic whose initial letters spelled out "ΙΗΣΌΎΣ ΧΡΕΙΣΤΟΣ ΘΕΟΥ ΎΊΟΣ ΣΩΤΗΡ ΣΤΑΎΡΟΣ" ("Jesus Christ, God's Son, Savior, Cross). Examples were in mediaeval paintings in Salisbury cathedral, and others are shown in the illustrations on this page.
- Giovanni Boccaccio’s Famous Women translated by Virginia Brown 2001; Cambridge and London, Harvard University Press; ISBN 0-674-01130-9; p. 42
- "The Sibyl of Erythrae and the Prophetic Acrostic of Christ", full-of-grace-and-truth.blogspot.com, January 23, 2010.
- Modern Gothic by Alexander Murray: Times Literary Supplement 24 October 2008 page 8.
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- Lactantius, Divinae institutiones I.6.8, 14
- Augustine, De civitate dei xviii.23
- Isidore, Etymologiae viii.8.1, 3, 4