The pursuit of Mithridates, who had thrown himself among the tribes inhabiting Bosphorus and the shores of the Maeotian Sea, presented great difficulties. News was also brought to Pompey that the Albanians had again revolted. This made him turn back, out of anger and determination not to be beaten by them, and with difficulty and great danger passed back over the Cyrnus, which the barbarous people had fortified a great way down the banks with palisadoes. And after this, having a tedious march to make through a waterless and difficult country, he ordered ten thousand skins to be filled with water, and so advanced towards the enemy, whom he found drawn up in order of battle near the river Abas, to the number of sixty thousand horse and twelve thousand foot, ill-armed generally, and most of them covered only with the skins of wild beasts. Their general was Cosis, the king's brother, who, as soon as the battle was begun, singled out Pompey, and rushing in upon him darted his javelin into the joints of his breastplate; while Pompey, in return, struck him through the body with his lance and slew him. It is related that in this battle there were Amazons fighting as auxiliaries with the barbarians, and that they came down from the mountains by the river Thermodon. For that after the battle, when the Romans were taking the spoils and plunder of the field, they met with several targets and buskins of the Amazons; but no woman's body was found among the dead. They inhabit the parts of Mount Caucasus that reach down to the Hyrcanian Sea, not immediately bordering upon the Albanians, for the Gelae and the Leges lie betwixt; and they keep company with these people yearly, for two months only, near the river Thermodon; after which they retire to their own habitations, and live alone all the rest of the year.
After this engagement, Pompey was eager to advance with his forces upon the Hyrcanian and Caspian Sea, but was forced to retreat at a distance of three days' march from it by the number of venomous serpents, and so he retreated into Armenia the Less. Whilst he was there, the kings of the Elymaeans and Medes sent ambassadors to him, to whom he gave friendly answer by letter; and sent against the King of Parthia, who had made incursions upon Gordyene, and despoiled the subjects of Tigranes, an army under the command of Afranius, who put him to the rout, and followed him in chase as far as the district of Arbela.
Of the concubines of King Mithridates that were brought before Pompey, he took none to himself, but sent them all away to their parents and relations; most of them being either the daughters or wives of princes and great commanders. Stratonice, however, who had the greatest power and influence with him, and to whom he had committed the custody of his best and richest fortress, had been, it seems, the daughter of a musician, an old man, and of no great fortune, and happening to sing one night before Mithridates at a banquet, she struck his fancy so that immediately he took her with him, and sent away the old man much dissatisfied, the king having not so much as said one kind word to himself. But when he rose in the morning, and saw tables in his house richly covered with gold and silver plate, a great retinue of servants, eunuchs, and pages bringing him rich garments, and a horse standing before the door richly caparisoned, in all respects as was usual with the king's favourites, he looked upon it all as a piece of mockery, and thinking himself trifled with, attempted to make off and run away. But the servants laying hold upon him, and informing him really that the king had bestowed on him the house and furniture of a rich man lately deceased, and that these were but the first fruits or earnests of greater riches and possession that were to come, he was persuaded at last with much difficulty to believe them. And so putting on his purple robes, and mounting his horse, he rode through the city, crying out, "All this is mine;" and to those at laughed at him, he said, there was no such wonder in this, but it was a wonder rather that he did not throw stones at all he met, he was so transported with joy. Such was the parentage and blood of Stratonice. She now delivered up this castle into the hands of Pompey, and offered him many presents of great value of which he accepted only such as he thought might serve to adorn the temples of the gods and add to the splendour of his triumph: the rest he left to Stratonice's disposal, bidding her please herself in the enjoyment of them.
And in the same manner he dealt with the presents offered him by the King of Iberia, who sent him a bedstead, table, and a chair of state, all of gold, desiring him to accept of them; but he delivered them all into the custody of the public treasurers, for the use of the commonwealth.
In another castle called Caenum, Pompey found and read with pleasure several secret writings of Mithridates, containing much that threw light on his character. For there were memoirs by which it appeared that, besides others, he had made away with his son Ariarathes by poison, as also with Alcaeus the Sardian, for having robbed him of the first honours in a horse-race. There were several judgments upon the interpretation of dreams, which either he himself or some of his mistresses had had; and besides these, there was a series of wanton letters to and from his concubine Monime. Theophanes tells us that there was found also an address by Rutilius, in which he attempted to exasperate him to the slaughter of all the Romans in Asia; though most men justly conjecture this to be a malicious invention of Theophanes, who probably hated Rutilius because he was a man in nothing like himself; or perhaps it might be to gratify Pompey, whose father is described by Rutilius in his history as the vilest man alive.