Dionysius Thrax (Greek: Διονύσιος ὁ Θρᾷξ, 170–90 BCE) was a Hellenistic grammarian and a pupil of Aristarchus of Samothrace. He was long considered to be the author of the earliest grammatical text on the Greek language, one that was used as a standard manual for perhaps some 1,500 years, and which was until recently regarded as the groundwork of the entire Western grammatical tradition.[a]
His place of origin was not Thrace as the epithet "Thrax" denotes, but probably Alexandria. His Thracian background was inferred from the name, considered to be Thracian, of his father Tērēs (Τήρης). One of his co-students during his studies in Alexandria under Aristarchus was Apollodorus of Athens, who also became a distinguished grammarian. Rudolf Pfeiffer dates his shift to the isle of Rhodes to around 144/3 BCE, when political upheavals associated with the policies of Ptolemy VIII Euergetes II are thought to have led to his exile. According to a report in Athenaeus' Deipnosophistae (11,489a, b), his Rhodian pupils, grateful for his learning, gathered enough silver to enable him to fashion a cup whose shape aspired to recreate that of Nestor mentioned in the Iliad ().
Dionysius was primarily an Homeric scholar, which was integral to his training under Aristarchus in Alexandria. His work shows some influence of earlier Stoic grammatical theory, particular on word classes. He is also reported by Varro to have been an erudite analyst of Greek lyric poetry, perhaps referring to his linguistic and prosodic use of that material. He wrote prolifically in three genres: philological questions (γραμματικά); running commentaries (ὑπομνήματα) and treatises (συνταγματικά). Of the last genre, he wrote a polemical monograph criticizing the Homeric interpretations of Krates. Another work he is said to have written was the Περὶ ποσοτήτων (On quantities). From the scholia[b] preserved from the critical works of Aristonicus and Didymus who excerpted Dionysius' work it is clear that he was decidedly independent in his textual judgements on the Homeric corpus, since he frequently contradicts his master's known readings. His teaching may have exercised a formative impact on the rise of Roman grammatical studies, if as an entry in the Suda suggests, the elder Tyrannion was one of his pupils. The founder of classical scholarship in Rome, L. Aelius Stilo may have profited from Dionysius' instruction, since he accompanied to Rhodes Q. Metellus Numidicus when the latter went into voluntary exile, and while Dionysius was still teaching there.
Dionysius Thrax was credited traditionally as the author of the first extant grammar of Greek, Art of Grammar (Τέχνη γραμματική, Tékhnē grammatikē). The Greek text, in August Immanuel Bekker's edition, runs to fifty pages.[c] Its importance in Byzantine scholarship is attested by the fact that commentaries on it by Byzantine scholiasts run to some 600 pages. The text itself was thought to be the unique extant example of a work by Hellenistic scholars. This general consensus began to break down when examinations of grammatical texts datable to a later period emerged among the finds of the Oxyrhynchus Papyri which, until relatively late, showed no awareness of key elements in the text attributed to Dionysius Thrax. It concerns itself primarily with a morphological description of Greek, lacking any treatment of syntax. The work was translated into Armenian sometime around the 5th to 6th centuries CE, and into Syriac around that same period.
Thrax defines grammar at the beginning of the Tékhnē as "the empirical knowledge of what is for the most part being said by poets and prose writers." He states that grammatikē, what we might nowadays call "literary criticism",[d] comprises six parts:
Paragraph 6 outlines the στοιχεῖα (stoikheia) or letters of the alphabet, together with the divisions into vowels, diphthongs and consonants.
Paragraphs 7-10 deal with syllables, long (μακραὶ συλλαβαί), short (βραχεῖαι συλλαβαί) and anceps (κοιναὶ συλλαβαί).
Paragraph 11 treats the eight word classes, though strong doubts exist as to whether or not this division goes back to Dionysius Thrax, since ancient testimonies assert that he conflated proper nouns and appellatives, and classified the article together with pronouns. In the text attributed to Dionysius, the eight classes. which Di Benedetto and others argue was probably developed by Tryphon several decades after Dionysius, are as follows:
Paragraphs 12-20 then elaborates successively on the parts of speech.
Modern scepticism over the attribution is associated with the pioneering work of Vincenzo Di Benedetto in particular, though as early as 1822 Karl Wilhelm Göttling, by analyzing the scholia on the text that had recently been collected and publisher by A. I. Bekker, concluded that the text as we have it was to be dated, not to the Hellinistic period but rather to Byzantine period. Göttling's thesis convinced neither Moritz Schmidt nor Gustav Uhlig, and disappeared from view. In 1958/1959, Di Benedetto revived doubts by comparing the received text with ancient grammatical papyri that had since come to light. He argued that before the 3rd to 4th centuries CE, no papyri on Greek grammar reveal material structured in a way similar to the exposition we have in Dionysius's treatise, that the surviving witnesses for the period before that late date, namely authors such as Sextus Empiricus, Aelius Herodianus, Apollonius Dyscolus and Quintilian, fail to cite him, and that Dionysius's work only begins to receive explicit mention in the works written from the 5th century onwards by such scholars as Timotheus of Gaza, Ammonius Hermiae and Priscian. Di Benedetto concluded that only the first five paragraphs of the treatise came from Dionysius' hand.