See Julian ad S. P. Q. A. p. 271. Jerom. in Chron. Aurelius Victor. Eutropius, x. 14 [7]. I shall copy the words of Eutropius, who wrote his abridgment about fifteen years after the death of Gallus, when there was no longer any motive either to flatter or to depreciate his character.
"Multis incivilibus gestis Gallus Caesar . . . vir natura ferus et ad tyrannidem pronior, si suo jure imperare licuisset."