DIOMEDES  , Latin grammarian, flourished at the end of the 4th

century A.D . He was the author of an extant Ars grammatica in three books, dedicated to a certain Atha.nasius . The third book is the most important, as containing extracts from Suetonius's De poetic . Diomedes wrote about the same time as Charisius (q.v.) and used the same sources independently . The works of both grammarians are valuable, but whereas much cf Charisius has been lost, the Ars of Diomedes has come down to us complete . In book i. he treats of the eight parts of speech; in ii. of the elementary ideas of grammar and of style; in iii. of quantity and metres . The best edition is in H . Keil's Grammatici Latini, i . ; see also C. von Paucker, Kleinere Studien, i . (1883), on the Latinity of Diomedes . i Chapters xi. and xii., which Lightfoot suggested might be the work of Pantaenus .