In the 17th book of his Ars grammatica, Priscian writes about accentual changes in certain adverbs, and asserts that he has specifically addressed the question in a book de accentibus (Prisc. GL III 132, 24-133, 2: haec enim quoque relatiua quidem grauantur per omnes syllabas, quando praeponuntur aliis dictionibus, quomodo et supra dicta nomina, de quibus in libro, qui est de accentibus, latius tractauimus; cfr. Giammona 2015, p. 61). Only during the 11th century, however, did a treatise on accents attributed to Priscian begin to circulate in Europe. Many doubts on its authenticity immediately began to circulate, until Keil’s definitive verdict: he rejected not only that the treatise was written by Priscian, but also that it might derive from a lost work de accentibus by the Caesarean grammarian (cfr. GL III, p. 401: «in exemplis vero barbara quaedam vocabula hic scriptor posuit, quorum alia non invenio nisi a scriptoribus infimae aetatis usurpata esse, alia, quamquam nescio quam auctoritatem habeant, tamen a Prisciani certe aetate et doctrina abhorrent»). [G. Cattaneo, tr. di c. Belanger]