Eumenes II
Eumenes II opposed him at the head of an army: but hostilities were soon suspended by the arrival of the Roman deputies, appointed by the Senate to inquire into the matters in dispute. Negotiations were accordingly opened at Pergamon but led to no result, the demands of Pharnaces being rejected by the Romans as unreasonable, and the war was in consequence renewed. It continued, apparently with various interruptions, until the summer of 179 BC, when Pharnaces, finding himself unable to cope with the combined forces of Eumenes II and Ariarathes IV, was compelled to purchase peace with the cession of all his conquests in Galatia and Paphlagonia, with the exception of Sinope. How long he continued to reign after this we know not; but it appears, from an incidental notice, that he was still on the throne in 170 BC, while he was certainly dead in 154 BC, when his brother Mithridates IV of Pontus is mentioned as King. The Greek historian Polybius accuses Pharnaces of having an arrogant and violent character, siding with the opinion of Eumenes II and the Romans.