1911 Encyclopedia Britannica
Aelius Festus Aphthonius
Latin grammarian, possibly of African origin, lived in the 4th century A.D. He wrote a metrical handbook in four books, which has been incorporated by Marius Victorinus in his system of grammar.
Keil, Grammatici Latini, vi.; Schultz, Quibus Auctoribus Aelius Festus Aphthonius usus sit (1885).
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Chisholm, Hugh, General Editor. Entry for 'Aelius Festus Aphthonius'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/a/aelius-festus-aphthonius.html. 1910.