In 35 BC he was prefect of Asia Minor, under Mark Antony, where he took prisoner Sextus Pompeius, who had fled there after his defeat by Agrippa in Naulochus (36 BC). After the Battle of Actium, 31 BC, Furnius, through the mediation of his son Gaius Furnius, was reconciled to Augustus and received from him the rank of a consular senator, and was afterwards appointed one of the suffect consuls in 29 BC. This is the first time the name of Furnius appears on the consular Fasti. He was prefect of Hispania Tarraconensis in 21 BC.