Rarum est ut Syri fidem servent, immo difficile. nam Palmyreni, qui iam victi atque contusi fuerant, Aureliano rebus Europensibus occupato non mediocriter rebellarunt. Sandarionem enim, quem in praesidio illic Aurelianus posuerat, cum sescentis sagittariis occiderunt, Achilleo cuidam parenti Zenobiae parantes imperium.
Translation :
It is a rare thing, or rather, a difficult thing, for the Syrians to keep faith. For the Palmyrenes, who had once been defeated and crushed, now that Aurelian was busied with matters in Europe, began a rebellion of no small size. For they killed Sandario, whom Aurelian had put in command of the garrison there, and with him six hundred bowmen, thus getting the rule for a certain Achilleus, a kinsman of Zenobia's.
Edition :
Historia Augusta, Volume III: The Two Valerians. The Two Gallieni. The Thirty Pretenders. The Deified Claudius. The Deified Aurelian. Tacitus. Probus. Firmus, Saturninus, Proculus and Bonosus. Carus, Carinus and Numerian. Translated by David Magie. Loeb Classical Library 263. Cambridge, MA: Harvard University Press, 1932.