The Annals and the Histories · Ann. 12.45

He then assumed a show of reconciliation with his father, to whom he returned, telling him all that could be accomplished by treachery was now ready and that he must complete the affair by the sword. Meanwhile Pharasmanes invented pretexts for war; when he was fighting with the king of the Albanians and appealing to the Romans for aid, his brother, he said, had opposed him, and he would now avenge that wrong by his destruction. At the same time he gave a large army to his son, who by a sudden invasion drove Mithridates in terror from the open country and forced him into the fortress of Gorneas, which was strongly situated and garrisoned by some soldiers under the command of Caelius Pollio, a camp-prefect, and Casperius, a centurion. There is nothing of which barbarians are so ignorant as military engines and the skilful management of sieges, while that is a branch of military science…

Cornelius Tacitus · trans. Church & Brodribb, 1876
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