Aventius is mentioned as Virgil's Aeneid, Book vii. 656, as an ally of Mezentius and enemy of Aenea.
"Next Aventinus drives his chariot round
The Latian plains, with palms and laurels crown'd.
Proud of his steeds, he smokes along the field;
His father's hydra fills his ample shield:
A hundred serpents hiss about the brims;
The son of Hercules he justly seems
By his broad shoulders and gigantic limbs;
Of heav'nly part, and part of earthly blood,
A mortal woman mixing with a god.
For strong Alcides, after he had slain
The triple Geryon, drove from conquer'd Spain
His captive herds; and, thence in triumph led,
On Tuscan Tiber's flow'ry banks they fed.
Then on Mount Aventine the son of Jove
The priestess Rhea found, and forc'd to love.
For arms, his men long piles and jav'lins bore;
And poles with pointed steel their foes in battle gore.
Like Hercules himself his son appears,
In salvage pomp; a lion's hide he wears;
About his shoulders hangs the shaggy skin;
The teeth and gaping jaws severely grin.
Thus, like the god his father, homely dress'd,
He strides into the hall, a horrid guest."
- Virgil's Aeneid, Book vii. 656