Gaius Arrius Antoninus
Gaius Arrius Antoninus was a Roman senator and jurist active in the last half of the second century AD, who held a number of offices in the emperor's service. The date when he was suffect consul is not attested, but has been estimated to be around AD 173. Edward Champlin includes him, along with Gaius Aufidius Victorinus and Tiberius Claudius Julianus, as "marked out as a special intimate of Fronto's." Champlin notes that while Victorinus received five of the surviving letters of the rhetor Fronto, "as the beloved pupil and son-in-law", Antoninus received four, taking "the place of Fronto's son."
He is thought to have a son, Gaius Arrius Quadratus, praetor of Dacia, Ulpia Traiana Sarmizegetusa.
Despite the similarity in names, Antoninus was not related to Gnaeus Arrius Antoninus, the maternal grandfather of the emperor Marcus Aurelius; Géza Alföldy notes an inscription attests that his father was a leading citizen of Cirta in North Africa.