Ventidius had had a checkered career. After captivity, possibly slavery
and manumission, Caesar had found him keeping a line of post horses and
pack mules for hire on the great Aemilian way, and had drafted him into
his transport service during the Gallic War. He suddenly became an
important man, and of course Caesar let him, as he let other chiefs of
departments, profit by war contracts. It was the only way he could
hold men of great ability on very small official salaries. Vergil had
doubtless heard of the meteoric rise of this _mulio_ even when he was
at school, for the post-road for Caesar's great trains of supplies led
through Cremona. After the war Caesar rewarded Ventidius further by
letting him stand for magistracies and become a senator--which of course
shocked the nobility. Muleteers in the Senate! The man changed his
cognomen to be sure, called himself Sabinus on the election posters, but
Vergil remembered what name he bore at Cremona. Caesar finally designated
him for the judge's bench, as praetor, and this high office he entered in
43. He at once attached himself to Antony, who used him as an agent to
buy the service of Caesarian veterans for his army. It was this that
stirred Cicero's ire, and Cicero did not hesitate to expose the man's
career. Vergil's lampoon is interesting then not only in its connections
with Catullus and the poet's own boyhood memories, but for its
reminiscences of Cicero's speeches and the revelation of his own
sympathies in the partizan struggle. The poem of Catullus and Vergil's
parody must be read side by side to reveal the purport of Vergil's
epigram.

Phaselus ille, quem videtis, hospites,
Ait fuisse navium celerrimus,
Neque ullius natantis impetum trabis
Nequisse praeterire, sive palmulis
Opus foret volare sive linteo.