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Demosthenes, Isaeus, Hyperides, Deinarchus, and others, were likewise commented upon by Didy-mus. Besides these numerous commentaries, we have mention of a work on the phraseology of the tragic poets (ircpl TpaycpdovfAzvTjs A&jews), of which the 28th book is quoted. (Macrob. Sat. v. 18; Harpocrat. s. v. £ripa\oi(peii'.) A similar work (Ae|fs /ccojiii/o?) was written by him on the phraseology of the comic poets, and Hesychius made great use of it, as he himself attests in the epistle to Eulogius. (Comp. EtymoL M. p. 492. 53; Schol. ad Apollon. Rhod. i. 1139, iv. 1058.) A third work of the same class was on words of ambiguous or uncertain meaning, and consisted of at least seven books; and a fourth treated on false or corrupt expressions. He further published a collection of Greek proverbs, in thirteen books (irpos tovs 7T6jol i^apoi^wv (ruj/Teraxoras), from which is taken the greater part of the proverbs contained in the collection of Zenobius. (Schneide-win, Corpus Paroemiogr. Graec. i. p. xiv.) A work on the laws of Solon is mentioned by Plutarch (Sol. 1) under the title nepl rajv d^ovow 20Acoz>0s. Didymus appears to have been acquainted even with Roman literature, for he wrote a work in six books against Cicero's treatise " de Re Publica," (Ammian. Marcell. xxii. 16), which afterwards induced Suetonius to write against Didymus. (Suid. s. v. TpayKv\\os.) Didymus stands at the close of the period in which a comprehensive and independent study of Greek literature prevailed, and he himself must be regarded as the father of the scholiasts who were satisfied with compiling or abridging the works of their predecessors.
In the collection of the Geoponica there are various extracts bearing the name of Didymus, from which it might be inferred that he wrote on agriculture or botany; but it is altogether uncertain whether those extracts belong to our Alexandrian grammarian, or to some other writer • of the same name. It is very probable that, with Suidas, we ought to distinguish from our grammarian a naturalist Didymus, who possibly may be the same as the one who wrote a commentary on Hippocrates, and a treatise on stones and different kinds of wood (irepl ^.ap/j.dpooi' Kal ircLvroicov £uAa>v), a treatise which has been edited by A. Mai as an appendix to the fragments of the Iliad. (Milan, 1819, fol.) See Grafenhan, Gesch. der Klass. Pliilol. im Alterthum, i. p. 405, &c.
2. An Alexandrian grammarian, commonly called the younger (6 jxeos) : he taught at Rome, and wrote, according to Suidas (s. v. AtSu^aos), 7rt0ai/a, Trepl dpQoypatyias, and many other excellent works. In a preceding article, however, Suidas attributes the iriQava (iriQavuiv kol (To<pLffp.aToov Xvfftis) in two books to one Didymus Areius, an Academic philosopher, who lived at Rome in the time of Nero. (Comp. Euseb. Praep. Evang. xi. 23; Eu-doc. p. 135.)
3. With the praenomen Claudius, a Greek grammarian, who, according to Suidas (s. v. Ai'SuyUos), wrote upon the mistakes committed by Thucydides against analogy, and a work on Analogy among the Romans. He further made an epitome of the works of Heracleon, and some other works. A fragment of his epitome is preserved in Stobaeus. (Serm. 101 ; comp. Lersch, Die Spracliphilos. der Alton, pp. 74, 143, &c.)
4. Of Alexandria, lived in the fourth century of the Christian era, and must be distinguished
from Didymus the monk, who is spoken of by Bo-crates. (Hist. Eccles. iv. 33.) At the age of four years, and before he had learnt to read, he became blind; but this calamity created in him an invincible thirst after knowledge, and by intense application he succeeded in becoming not only a distinguished grammarian, rhetorician, dialectician, mathematician, musician, astronomer, and philosopher (Socrat. iv. 25; Sozom. iii. 15 ; Rufin. xi. 7 ; Theodoret. iv. 29 ; Nicephor. ix. 17), but also in acquiring a most extensive knowledge of sacred literature. He devoted himself to the service of the church, and was no less distinguished for the exemplary purity of his conduct than for his learning and acquirements. In A. d. 392, when Hiero-nymus wrote his work on illustrious ecclesiastical authors, Didymus was still alive, and professor of theology at Alexandria. He died in a. d. 396 at the age of eighty-five. As professor of theology he was at the head of the school of the Catechumeni, and the most distinguished personages of that period, such as Hieronymus, Rufinus, Palladius, Ambrosius, Evagrius, and Isidorus, are mentioned among his pupils. Didymus was the author of a great number of theological works, but most of them are lost. The following are still extant:— 1. " Liber de Spiritu Sancto." The Greek original is lost, but we possess a Latin translation made by Hieronymus, about a. d. 386, which is printed among the works of Hieronymus. Although the author as well as the translator intended it to be one book (Hieronym. Gated. 109), yet Marcianaeus in his edition of Hieronymus has divided it into three books. The work is mentioned by St. Au-gustin (Quaest. in E-xod. ii. 25), and Nicephorus (ix. 17). Separate editions of it were published at Cologne, 1531, 8vo., and a better one by Fuchte, Helmstadt, 1614, 8vo. 2. "Breves Enarrationes in Epistolas Canonicas." This work is likewise extant only in a Latin translation, and was first printed in the Cologne edition of the first work. It is contained also in all the collections of the works of the fathers. The Latin translation is the work of Epiphanius, and was made at the request of Cassiodorus. (Cassiod. de Institut. Divin. 8.)
3. " Liber ad versus Manichaeos." This work appears to be incomplete, since Damascenus (Parallel. p. 507) quotes a passage from it which is now not to be found in it. It was first printed in a Latin version by F. Turrianus in Possevin's Apparatus Sanct. ad Cole. Lit. D.., Venice, 1603, and at Cologne in 1608. It was reprinted in some of the Collections of the Fathers, until at last Combefisius in his "Auctarium novissimum " (ii. p. 21, &c.) published the Greek original. (Paris, 1672, fol.)
4. TLepl TpiaSos. This work was formerly believed to be lost, but J. A. Mingarelli discovered a MS. of it, and published it with a Latin version at Bologna, 1769, fol. A list of the lost works of Didymus is given by Fabric. Bibl. Graec. ix. p. 273, &c. ; compare Cave, Hist. Lit. i. p. 205; Guericke, de Schola Alexandr. ii. p. 332,&c. [L. S.] DI'DYMUS (AfBi/Mos), a Greek medical writer who lived perhaps in the third century after Christ, as he is quoted by Ae'tius (tetrab. ii. serm. ii. c. 15, p. 256) and Alexander Trallianus (De Med. vii. 13, p. 235), by whom he is called <ro<pcarcLros. He may perhaps be the native of Alexandria who is mentioned by Suidas as having written fifteen books on Agriculture, and who is frequently quoted in the collection of writers called Geoponici (lib. L