A friend of Caesar, and one of his companions in arms as in politics. In B.C. 58 he was
Caesar's legate in Gaul, was praetor in 46, and consul in 43, when, acting for Octavian, he
defeated Antony at Mutina. He completed Caesar's Commentarii de Bello Gallico
by adding an eighth book (Iul.
56). According to the dedication to Cornelius
Balbus prefixed to that book, he contemplated the continuation of Caesar's account of the
Civil War to Caesar's death. This intention he never carried out, as he fell in battle at
Mutina, April 27, B.C. 43, when he was consul. Of the three works, the Bellum
Alexandrinum, Bellum Africanum
, and Bellum Hispaniense
, which have
come down to us with Caesar's commentaries, the first may have been written by him. Of the
other two, it has been conjectured that they were composed at his request, in preparation for
his intended work on military commanders, and that having been found at his death among his
papers, they were added, with his own writings, to the works of Caesar himself. A short letter
of Hirtius to Cicero is found in Ad Att.
xv. 6. He is known to have written, at
Caesar's instigation, an answer to Cicero's panegyric on Cato (Ad Att.
40.1, 41.4, 44.1, 45.3, 47.3). See Caesar