He was a legate of Julius Caesar's starting around 54 BC and served as an envoy to Pompey in 50. It was reported that Hirtius dined with Caesar, Sallust, Oppius, Balbus and Sulpicus Rufus on the night after Caesar's famous crossing over the Rubicon river into Italy January 10.
Initially a supporter of Mark Antony, Hirtius was successfully lobbied by Cicero (who was a personal friend) and switched his allegiance to the senatorial party. He then set out with an army to attack Antony who was besieging Mutina. In concert with Gaius Vibius Pansa Caetronianus and Octavian, Hirtius compelled Antony to retire but in the fighting was slain (around 25 April or 27 April). He was honored with a public funeral, along with Pansa who died a few days later.
Hirtius added an eighth book to Caesar's De Bello Gallico and is the likely author of De Bello Alexandrino. The ancients thought he also wrote the De Bello Africo and De Bello Hispaniensi, but it is now considered more likely that he acted as an editor. Hirtius' correspondence with Cicero was published in nine books, but has not survived.
Suetonius in Chapter 68 of his Life of Augustus writes that Lucius Antonius, the brother of Mark Antony accused the Emperor Augustus for having "given himself to Aulus Hirtius in Spain for three hundred thousand sesterces." This alleged homosexual liaison must have taken place in 46 BC during the civil wars when Julius Caesar took Augustus to Spain and Aulus Hirtius was serving there. At the time the future Emperor Augustus was 17 years old.
- Dando-Collins, Stephan (2002). The Epic Saga of Julius Caesars Tenth Legion and Rome. p. 67. ISBN 0-471-09570-2.
- Syme, Roman Revolution p.95. Hirtius was already consul-designate for 43 on the Ides of March, therefore likely a nominee of Caesar's.
- Suetonius, Augustus 68, translated by John Carew Rolfe.
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Gaius Julius Caesar Octavianus and Quintus Pedius