AULUS, a noble Roman who attended on Caesar in his wars against the Gauls, and, when he returned to Rome, became the devoted friend of Cicero. He accompanied him to Tusculum, where he studied the art of declamation under that accomplished orator (Cic. Fam. vii. 33); and when Caesar returned from his successful expedition against his enemies in Africa, he was employed by Cicero to make his peace with the conqueror. Hirtius continued a firm friend to Caesar, and on his death became an equally determined opponent of the ambitious views of Antony. He was elected consul a. c. 43, with Pansa, and, after his recovery from a severe illness, proceeded with his colleague to relieve Brutus, who was besieged in Mutina by Antony. They gained the battle, and put Antony to flight; but Hirtius fell in his attack on the camp (Phil.