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In modern English, the nouns vates and ovate (, ), are used as technical terms for ancient Celtic bards, prophets and philosophers. The terms correspond to a Proto-Celtic word which can be reconstructed as *w?tis. They are sometimes also used as English equivalents to later Celtic terms such as Irish fáith "prophet, seer".
The terminology discussed in this article relates to an Old Celtic word which can be reconstructed as *w?tis. This word is not directly attested, but is known from renderings into Greek and Latin and from its descendants in later Celtic languages.
Vates in English is a borrowing of a Latin noun v?t?s (pronounced ['wa:te:s]), 'prophet, poet'. This Latin noun was either a cognate of Celtic *w?tis (whereby the two words were descended from a common Italo-Celtic origin), or the Latin word was a loanword directly from Celtic. Despite being borrowed from the Latin form, the English word is generally used about ancient Celtic seers rather than Roman ones.
Ovate in English is a borrowing and adaptation of a Greek rendering of the same Celtic term *w?tis, first attested in the work of the Ancient Greek writer Strabo. Strabo rendered the Celtic term in Greek in the plural as ouáteis (?, Koine: [uá:ti:s]). The English word ovate is pronounced the way it is due to a misunderstanding of how the Greek word was pronounced.
Celtic w?tis is widely thought to have cognates in the Germanic languages, such as the Gothic term wods 'possessed' (though Ludwig Rübekeil 2003 has suggested that the name of the Common Germanic deity *Winaz may in fact be an early loanword, an adjective *vatinos based on Celtic vates).
Virgil uses the Latin vannus "winnowing basket" (conceivably from *wat-nos, compare Old High German wadal, modern German Wedel, with the same meaning, from *wat-lo-) for something borne about in the Bacchic festival, suggesting that the root may have had an ecstatic sense in Italic also. The likelihood of this etymology and its relevance to the word vates is, however, doubtful.
The earliest Latin writers used vates to denote prophets and soothsayers in general; the word fell into disuse in Latin until it was revived by Virgil. Thus Ovid could describe himself as the vates of Eros (Amores 3.9).
In pagan Rome the vates resided on the Vatican Hill, the Hill of the Vates. The Vatican Hill takes its name from the Latin word Vaticanus, a vaticiniis ferendis, in allusion to the oracles, or Vaticinia, which were anciently delivered on the Vatican Hill. (When the papacy was returned to Rome from Avignon (France) in the 14th Century, the Vatican became the residence of the Pope, and the word Vatican came to refer to the enclave in the middle of Rome that had become the seat of the Roman Catholic Church.)
According to the Ancient Greek writers Strabo, Diodorus Siculus, and Poseidonius, the vates (?) were one of three classes of Celtic priesthood, the other two being the druids and the bards. The Vates had the role of seers and performed sacrifices (in particular administering human sacrifice) under the authority of a druid according to Roman and Christian interpretation.
An ovate is also the initial level one can attain in the modern Welsh Gorsedd of Bards. The Gorsedd is not a neo-druidic entity like the one mentioned above, but is more concerned with Welsh arts and culture; however, the ceremony and practices are largely based on reimaginings of druidism by Iolo Morganwg.