Helenius Acron (or Acro) was a Roman commentator and

grammar In linguistics, grammar is the set of rules for how a natural language is structured, as demonstrated by its speakers or writers. Grammar rules may concern the use of clauses, phrases, and words. The term may also refer to the study of such rul ...

ian, probably of the 3rd century AD, but whose precise date is not known. Helenius Acron is known to have written on Terence ('' Adelphi'' and '' Eunuchus'' at least) and

Horace Quintus Horatius Flaccus (; 8 December 65 BC – 27 November 8 BC), Suetonius, Life of Horace commonly known in the English-speaking world as Horace (), was the leading Roman lyric poet during the time of Augustus (also known as Octavian). Th ...

. These commentaries on Horace are now lost but are referred to by the grammarian Charisius. There is some evidence for a commentary on Persius. '' Scholia'' attributed to Acron appear in manuscripts of Horace; there are three recensions known, the earliest dating to the 5th century. The fragments which remain of the work on Horace, though much mutilated, are valuable, as containing the remarks of the older commentators, Quintus Terentius Scaurus and others. The attribution to Acron, however, is not found before the 15th century, and is doubtful. The scholiast may therefore be called Pseudo-Acron. Fragments of Acron's writing may also appear in Pomponius Porphyrion.

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*''Acronis et Porphyrionis commentarii in Q. Horatium Flaccum''. Edidit Ferdinandus Hauthal
vol. 1vol. 2
Berolini sumptibus Julii Springeri, 1864. * Heleni Acronis
commentarium in Horatium Flaccum
' at www.horatius.net. 3rd-century Romans Post–Silver Age Latin writers Grammarians of Latin Horace 3rd-century writers in Latin {{AncientRome-writer-stub