Update 1: Terrence reminded me that virgil.org has Aelius Donatus' Life of Virgil.
Suetonius, Life of Vergil from de viris illustribus, Life of Poets.
… Seneca has said that the poet Julius Montanus used to declare that he could also have purloined some of Vergil's work, if he could also have stolen his voice, expression, and dramatic power; for the same verses sounded well when Vergil read them, which on another's lips were flat and toneless. Hardly was the "Aeneid" begun, when its repute became so great that Sextus Propertius did not hesitate to declare:
"Yield, ye Roman writers; yield, ye Greeks;
A greater than the Iliad is born."
read all at LacusCurtius
