Titus Livius (Livy), The History of Rome, Book 44
William A. McDevitte, Sen. Class. Mod. Ex. Schol. A.B.T.C.D., Ed.

24. At this time Perseus sent to Eumenes and Antiochus, a common message, which the state of affairs seemed to suggest; [p. 2083]that “a free state, and a king, were, in their natures, hostile to each other. [2] That the Roman people were accustomed to attack kings singly; and, what was more shameful, to conquer them, by the power of other kings. [3] Thus, his father was overpowered by the aid of Attalus; and by the assistance of Eumenes, and of his father Philip, in part, Antiochus had been vanquished; and now, both Eumenes and Prusias were armed against himself. [4] If the regal power should be abolished in Macedonia, the next, in their way, would be Asia, which they had already rendered, in part, their own, under the pretence of liberating the states; and next to that Syria. [5] Already Prusias was honoured by them, far beyond Eumenes; and already Antiochus, though victorious, was debarred from Egypt, the prize of his arms.” [6] He desired that each of them, “considering these matters seriously, should see that he either compelled the Romans to make peace with him, or, if they should persist in such an unjust war, he should regard them as the common enemies of all kings.” [7] The message to Antiochus was sent openly; the ambassador to Eumenes went under the pretence of ransoming prisoners. But some more secret business was transacted between them, which, in addition to the jealousy and distrust already conceived by the Romans against Eumenes, brought on him charges of a heavier nature. [8] For they considered him as a traitor, and nearly as an enemy, while the two kings laboured to overreach each other in schemes of fraud and avarice. [9] There was a Cretan, called Cydas, an intimate of Eumenes; this man had formerly conferred, at Amphipolis, with one Chimarus, a countryman of his own, serving in the army of Perseus; and he, afterwards, had had one interview with Menecrates, and another with Archidamus, officers of the king, at Demetrias, close under the wall of the town. [10] Herophon, too, who was sent on that business, had, before that, executed two embassies to the same Eumenes. [11] These furtive conferences and embassies were notorious; but what the subject of them was, or what agreement had taken place between the kings, remained a secret.