Suetonius, Divus Augustus 15
“Following the capture of Perusia, [Augustus] turned his mind to vengeance on many people—facing those who were trying to beg forgiveness or make an excuse with one response: “you must die.”
Some authors record that three hundred people from both orders were picked out from the war-prisoners and slaughtered like sacrificial animals at the altar built to Divine Julius on the Ides of March. There are those who report that he turned to war with a specific plan, namely to trap his secret adversaries and those whom fear rather than willingness constrain and, once the model of Lucius Antonius* was offered, to pay the bonuses promised to veterans once he had conquered his enemies and liquidated their assets.”
Perusia capta in plurimos animadvertit, orare veniam vel excusare se conantibus una voce occurrens “moriendum esse.” Scribunt quidam trecentos ex dediticiis electos utriusque ordinis ad aram Divo Iulio exstructam Idibus Martiis hostiarum more mactatos. Exstiterunt qui traderent conpecto eum ad arma isse, ut occulti adversarii et quos metus magis quam voluntas contineret, facultate L. Antoni ducis praebita, detegerentur devictisque iis et confiscatis promissa veteranis praemia solverentur.
*Lucius (Marcus Antonius’ brother) had been a target of the siege at Perusia. Octavian [Augustus] let him live and sent him to serve as governor in what is now Spain.