Neilson Carel Debevoise, A Political History of Parthia (1938)
“ L. Caesennius Paetus, formerly with Corbulo and now governor of Syria, informed Vespasian of a projected alliance of Antiochus of Commagene and his son Epiphanes with Vologases against Rome. The union would have been dangerous, for Samosata, the capital of Commagene, lay on the Euphrates at one of the best crossings. The Parthians would thus have an excellent base for operations in Syria and Cilicia. Paetus was given authority to proceed against Antiochus, which he did with all possible speed. ”
