Gaius Caesar was born the day before the Kalends of September in the consulship of his father and Gaius Fonteius Capito. Conflicting testimony makes his birthplace uncertain. Gnaeus Lentulus Gaetulicus writes that he was born at Tibur; Pliny the Elder, that he was born among the Treveri, in a village called Ambitarvium above the Confluence. Pliny adds as proof that altars are shown there, inscribed “For the Delivery of Agrippina.” Verses which were in circulation soon after he became emperor indicate that he was begotten in the winter-quarters of the legions: “He who was born in the camp and reared mid the arms of his country, Gave at the outset a sign that he was fated to rule.” I myself find in the Acta Publica that he first saw the light at Antium.
Gaetulicus is shown to be wrong by Pliny, who says that he told a flattering lie, to add some luster to the fame of a young and vainglorious prince from the city sacred to Hercules; and that he lied with the more assurance because Germanicus really did have a son born to him at Tibur, also called Gaius Caesar, of whose lovable disposition and untimely death I have already spoken. Pliny, on the other hand, has erred in his chronology— for the historians of Augustus agree that Germanicus was not sent to Germany until the close of his consulship, when Gaius was already born. Moreover, the inscription on the altar adds no strength to Pliny’s view, for Agrippina twice gave birth to daughters in that region, and any childbirth, regardless of sex, is called puerperium, since the men of old called girls puerae, just as they called boys puelli.
Furthermore, we have a letter written by Augustus to his granddaughter Agrippina, a few months before he died, about the Gaius in question (for no other child of the name was still alive at that time), reading as follows: “Yesterday I arranged with Talarius and Asillius to bring your boy Gaius on the fifteenth day before the Kalends of June, if it be the will of the gods. I send with him besides one of my slaves who is a physician, and I have written Germanicus to keep him if he wishes. Farewell, my own Agrippina, and take care to come in good health to your Germanicus.” I think it is clear enough that Gaius could not have been born in a place to which he was first taken from Rome when he was nearly two years old. This letter also weakens our confidence in the verses, the more so because they are anonymous. We must then accept the only remaining testimony, that of the public record, particularly since Gaius loved Antium as if it were his native soil, always preferring it to all other places of retreat, and even thinking, it is said, of transferring thither the seat and abode of the empire through weariness of Rome