Probably a pseudonym for some agent of Gaius Antonius, though some suggest that it stands for Antonius himself.

Menander, ταὐτόματον ἡμῶν καλλίω βουλεύεται.

Cicero Letters to Atticus, v. I — Part 18

oportere, eodemque tempore aget praetor ad populum. Res eius modi est, ut ego nec per bonorum nec per popularem existimationem honeste possim hominem defendere, nec mihi libeat, quod vel maximum est. Etenim accidit hoc, quod totum cuius modi sit, mando tibi, ut perspicias. Libertum ego habeo sane nequam hominem, Hilarum dico, ratiocinatorem et clientem tuum. De eo mihi Valerius interpres nuntiat, Thyillusque se audisse scribit haec, esse hominem cum Antonio; Antonium porro in cogendis pecuniis dictitare partem mihi quaeri et a me custodem communis quaestus libertum esse missum. Non sum mediocriter commotus neque tamen credidi, sed certe aliquid sermonis fuit. Totum investiga, cognosce, perspice et nebulonem illum, si quo pacto potes, ex istis locis amove. Huius sermonis Valerius auctorem Cn. Plancium nominabat. Mando tibi plane totum, ut videas cuius modi sit.

Cicero Letters to Atticus, v. I — Part 18

Pompeium nobis amicissimum constat esse. Divortium Muciae vehementer probatur. P. Clodium, Appi f., credo te audisse cum veste muliebri deprehensum domi C. Caesaris, cum pro populo fieret, eumque per manus servulae servatum et eductum; rem esse insigni infamia. Quod te moleste ferre certo scio.

Cicero Letters to Atticus, v. I — Part 18

Quod praeterea ad te scribam, non habeo, et mehercule eram in scribendo conturbatior. Nam puer festivus anagnostes noster Sositheus decesserat, meque plus quam servi mors debere videbatur, commoverat.

retirement, and a praetor will bring the motion forward. Under my circumstances I couldn’t honourably champion him. I should lose the respect of both parties if I did: and what’s more, I wouldn’t, if I could, in view of certain things that have happened, to which I should like to call your attention. There’s a freedman of mine, an utter scoundrel—Hilarus I mean—an accountant and a client of yours. Valerius the interpreter sends me news of him, and Thyillus says he has heard too that the fellow is with Antony, and that Antony, when he is making requisitions, always asserts that part is levied on my authority, and that I have sent a freedman to look after my share. I am considerably annoyed, though I hardly believe the story: but there has been a good deal of talk. Look into the matter thoroughly and try to get to the bottom of it, and, if you possibly can, get that rascal shifted. Valerius mentioned Cn. Plancius as his authority for the statement. I leave the whole matter entirely in your hands to investigate.