"He was a legate of Julius Caesar´s starting around 58 BC and served as an envoy to Pompey in 50. It was reported that Hirtius dined with Caesar, Sallust, Oppius, Balbus and Sulpicius Rufus on the night after Caesar´s famous crossing over the Rubicon river into Italy on 10 January 49 BC.
During Caesar´s Civil War he served in Spain; he may have been a tribune in 48, and in 47 was at Antioch. He was a praetor in 46 and governor of Transalpine Gaul in 45.
After Caesar´s assassination in March 44, Hirtius was deeply involved in the maneuvering between parties. Having been nominated for that post by Caesar, Hirtius and Pansa became consuls in 43." - (en.wikipedia.org 18.11.2019)
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