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Vales, xxvi. p. 568.) Livy asserts that after the battle of Cannae, Gelon was preparing to abandon the alliance of Rome for that of Carthage, and that he was only prevented from doing so by his sudden death; but this seems quite at variance with the statement of Polybius of his uniform submission to his father's views, and may very likely deserve as little credit as the insinuation with which Livy immediately follows it—that his death occurred so opportunely, as to cast suspicion upon Hieron himself. (Liv. xxiii. 30.) Gelon was married to Nereis, daughter of Pyrrhus, by whom he left a son, Hieronymus, and a daughter, Harmonia, married to a Syracusan named Themistus. (Polyb. vii. 4 ; Justin. xxviii. 3; Paus. vi. 12. § 3.) Archimedes dedicated to him his treatise called Arenarius, in which it may be observed that he addresses him by the title of king. (Arenar. p. 319. ed Torell.)
The coins referred by earlier writers to the elder Gelon are generally admitted by modern numismatists to belong to this prince ; the head on the obverse is probably that of Gelon himself ; though Eckhel (vol. i. p. 255) considers it as that of the elder Gelon, and that the coins were struck in his honour, under the reign of Hieron II.
3. A native of Epeirus, in the service of Neoptolemus II., king of that country, who took occasion to form a plot against the life of Pyrrhus, when that prince and Neoptolemus had met to perform a solemn sacrifice. The conspiracy was, however, discovered, and Neoptolemus himself assassinated by his rival, b. c. 296. (Plut. Pyrrh, 5.) [E.H.B.]
GEMINA, one of the ladies who attended the philosophical instructions of Plotinus when he was at Rome in the early part of the reign of the em peror Philip, a. d. 244. Her affluence is indicated by the circumstance that the philosopher resided and taught in her house, and her age by the cir cumstance that her daughter, of the same name with herself, was also one of his zealous disciples. (Porphyr. Vit. Plotin. c. 3, 9.) [J. C. M.J
GEMINIUS, 1. C. Praetor of Macedonia, b.c. 92. He sustained a severe defeat from the Maedians, a Thracian tribe, who afterwards ravaged the province. (Liv. Epit. 70 ; Jul. Obseq. de Prodig. 113.)
2. A decurio of Terracina, and a personal enemy of C* Marius the elder. The troop of horse which discovered Marius in the marshes of Minturnae, b. c. 88, had been despatched by Geminius to apprehend him. (Plut. Mar. 36, 38.)
3.-A zealous partizan of M. Antony, was deputed by the triumvir's friends in Rome to remonstrate with him on his ruinous connection with Cleopatra. Geminius went to Athens in the winter of b. c. 32—31, but could not obtain a private audience from Antony. At length, being menaced by Cleopatra with the torture, he withdrew from Athens, leaving his mission unaccomplished. (Plut. Ant. 59.)
GEMINUS (Tefuvos). This name comes down to us in the manuscripts of Proclus, with a circumflex on the penultimate syllable. Gerard Vos-sius believes, nevertheless, that it is the Latin word: Petavius and Fabricius admit the circumflex without other comment than reference to Proclus. Any one is justified in saying either Gemlnus or Gemfnus, according to his theory.
Of the man belonging to this dubious name we know nothing but that, from a passage in his works relative to the Egyptian annus vagus of 120 years before his own time, it appears that he must have been living in the year b. c. 77. He was a Rhodian, and both Petavius and Vossius suspect that he wrote at Rome ; but perhaps on no stronger foundation than his Latin name and his Greek tongue, which make them suppose that he was a libertus. Proclus mentions him (p. 11 of Grynoeus) as distinguishing the mathematical sciences into vo^rA and aftrfljjra, in the former of which he places geometry and arithmetic, in the latter mechanics, astronomy, optics, geodesy, ca-nonics, and logic (no doubt a corruption of logistics, or computation ; Barocius has ars supputatrwi). Again (p. 31) Proclus mentions him as author of a geometrical work containing an account of spiral, conchoid, and cissoid lines. But Delambre (Astr. Anc. vol. i. p. 211) saw reason to question the skill of Geminus both in arithmetic and geometry.
The only work of Geminus now remaining is the Eiffayayr) fls rot, &cuv6(JL*i>a9 which many wrongly make to be a commentary on the Plmeno-mena of Aratus. The work on the sphere attributed to Proclus is not much more than an abridgment of some chapters of Geminus. The book of the latter is a descriptive treatise on elementary astronomy, with a great deal of historical allusion. There is a full account of it in Delambrt (I. c.). The total rejection of the supposed effects of the risings and settings of the stars, &c. upon the weather is creditable to Geminus. The work was first published by Edo Hildericus, Gr. Lat. Altorf, 1590, 8vo. This edition was reprinted at Ley den, 1603, 8vo. H. Briggs diligently compared the edition with a manuscript at Oxford, and handed the results to Petavius, whc made a similar comparison with another mamiscripi of his own, and published a corrected editior (Gr. Lat.) in his Uranologion^ Paris, 1630, fol The most recent edition is that in Halma's editior of Ptolemy, Paris, 1819, 4to. Petavius also informs us that another work of Geminus was sent t< England in manuscript, with other portions of th( library of Barocius (the editor of Proclus, w( presume). (Proclus ; Fabric. Bill. Graec. vol. iv p. 31, &c.; Petavius, Uranologion; Weidler, Hist Astron. ; Delambre, Astron. Anc.) [A. De M."