Titus Livius (Livy), The History of Rome, Book 35
Cyrus Evans, Ed.

13. Nabis immediately despatched emissaries through all the towns on the coast, to sow dissensions among the inhabitants: some of the men in power he brought over to his party [p. 1566]by presents; others, who more firmly adhered to the alliance with Rome, he put to death. [2] The charge of' protecting all the Lacedaemonians on the coast, had been committed by Titus Quinctius to the Achaeans; they therefore instantly sent ambassadors to the tyrant, to remind him of his treaty with the Romans, and to warn him against violating a peace which he had so earnestly sued for. [3] They also sent succours to Gythium which he had already besieged, and ambassadors to Rome to make known these transactions. [4] King Antiochus having, this winter, solemnized the nuptials of his daughter with Ptolemy, king of Egypt, at Raphia, in Phœnicia, returned thence to Antioch, and came, towards the end of the season, through Cilicia, after passing Mount Taurus, to the city of Ephesus. [5] Early in the spring, he sent his son Antiochus thence into Syria, to guard the remote frontiers of his dominions, lest, during his absence, any commotion might arise behind him and then he marched himself, with all his land forces, to attack the Pisidians, inhabiting the country near Sida. [6] At this time, Publius Sulpicius and Publius Villius, the Roman ambassadors, who were sent to Antiochus, as above mentioned, having received orders to wait on Eumenes, first came to Elaea, and thence went up to Pergamus, for the palace of Eumenes was there. Eumenes was very desirous of a war against Antiochus, for he thought that, if peace continued, a king so much superior in power would be a troublesome neighbour; [7] but that, in case of hostilities, he would prove no more a match for the Romans than Philip had been; and that, either he would be entirely removed out of the way, or, should peace be granted to him, after a defeat he (Eumenes) might reasonably expect, that a great deal of what should be taken from Antiochus would fall to his own share; [8] so that, in future, he might be very well able to defend himself against him, without any aid from the Romans; [9] and even if any misfortune were to happen, it would be better for him, in conjunction with the Romans, to undergo any turn of fortune, than, standing alone, either suffer himself to be ruled by Antiochus, or, on refusal, be compelled to submission by force of arms. [10] Therefore, with all his influence, and every argument which he could devise, he urged the Romans to a war.