Antonia (gens)

The gens Antonia was a Roman family of great antiquity, with both patrician and plebeian branches. The first of the gens to achieve prominence was Titus Antonius Merenda, one of the second group of Decemviri called, in 450 BC, to help draft what became the Law of the Twelve Tables.

Marcus Antonius, the triumvir, pretended that his gens was descended from Anton, a son of Heracles. We are told that he harnessed lions to his chariot to commemorate his descent from this hero; and many of his coins bear a lion for the same reason.

The patrician Antonii used the praenomina Titus and Quintus. Titus does not appear to have been used by the plebeian Antonii, who instead used Quintus, Marcus, Lucius, and Gaius. There is also one instance of Aulus, while Marcus Antonius the triumvir named one of his sons Iulus. This name, also borne by a later descendant of the triumvir, may have been an ancient praenomen revived by the family, but it was probably also intended to call to mind the connections of the Antonii with the illustrious gens Julia.

The patrician Antonii bear the cognomen Merenda; the plebeian Antonii bear no surname under the Republic, with the exception of Quintus Antonius, propraetor in Sardinia in the time of Sulla, who is called Balbus on coins.

...
Wikipedia