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{{Lewis
|lshtext=<b>Gāĭus</b>: (less correctly Cāĭus;<br /><b>I</b> trisyl., Cat. 10, 30; Mart. 9, 22, 12; 11, 36, 8); gen. Gāi (voc. Gāi, Mart. 10, 16, 1), m., and Gāĭa, ae, f. for [[Gavius]]; from [[gaudeo]], a Roman prœnomen, usu. written C.;<br /> v. the [[letter]] G. Gaia [[was]] written O, Quint. 1, 7, 28; Vel. Long. p. 2218; P. prol. p. 1502.— At [[marriage]] festivals it [[was]] [[customary]] to [[call]] the [[bridegroom]] and [[bride]] [[Gaius]] and Gaia, Fest. s. v. Gaia, p. 71; Quint. l. l.; Cic. Mur. 12 fin.—<br /><b>II</b> In partic.<br />&nbsp;&nbsp;&nbsp;<b>A</b> An [[eminent]] [[jurist]] [[who]] lived [[about]] A.D. 110-180, [[author]] of the Institutionum Commentarii IV., [[which]] [[contain]] a [[systematic]] [[summary]] of the Roman [[law]] of [[family]] relations, of [[private]] [[property]], and of actions; and [[which]] for generations [[was]] a [[standard]] educational [[work]] on the [[subject]]. This [[work]] [[was]] [[known]], [[however]], to [[modern]] scholars [[only]] by the fragments preserved in the Pandects, etc., [[until]] in 1816 Niebuhr discovered in the Chapter House of [[Verona]] a [[nearly]] [[complete]] MS. of the [[original]] [[work]] of [[Gaius]], [[over]] [[which]] works of St. Jerome had been written. Teuffel, Gesch. d. Röm. Lit. p. 812 sqq.—<br />&nbsp;&nbsp;&nbsp;<b>B</b> In [[post]]-Aug. historians, esp., the [[emperor]] [[Gaius]] Caligula; [[hence]], Gāiānus or Cāiānus, a, um, adj., of or belonging to Caligula: [[custodia]], Sen. Tranq. 11: [[clades]], id. ib. 14 fin.: expeditiones, Tac. 4, 15: nex, Suet. Tit. 1: as ([[because]] lowered in [[value]] by him), Stat. Sil. 4, 9, 22.
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{{Gaffiot
|gf=(1) <b>Gāĭus</b>,⁵ Gāī, m., <b>Gāia</b>, æ, f., prénom romain ; anc. orth. [[Caius]], [[Caia]] || appellations anciennes du fiancé et de la fiancée ([[ubi]] tu [[Gaius]], [[ego]] [[Gaia]]) : P. Fest. 95 ; Quint. 1, 7, 28 ; Cic. Mur. 27. en poésie tantôt Gāĭŭs, tantôt Gājŭs.<br />(2) <b>Gāĭus</b>, ī, m., célèbre jurisconsulte, 2<sup>e</sup>&nbsp;s. apr. J.-C.
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