Titus Livius (Livy), The History of Rome, Book 42
Evan T. Sage, Ph.D. and Alfred C. Schlesinger, Ph.D., Ed.

29. In the consulship of Publius Licinius and¹ Gaius Cassius, not only the city of Rome and the land of Italy, but also all kings and states both in Europe and in Asia, had turned their minds to concern over the war between Macedonia and Rome. [2] Eumenes was urged on by his former enmity and quite as much by his fresh anger, because through the king's crime he had been almost slaughtered like a beast for sacrifice at Delphi.² [3] Prusias, the king of Bithynia, [p. 375]had determined to refrain from arms and await the³ outcome; for, he thought, the Romans for their part could not think it right that he should take up arms against his wife's brother, and, as for Perseus, if he conquered, reconciliation might be effected with him through his sister.⁴ [4] Ariarathes, the king of Cappadocia, apart from the fact that he had promised aid directly to the Romans, was from the time of his alliance in marriage with Eumenes in harmony with the latter in all plans for peace or war.⁵ [5] Antiochus was indeed threatening the kingdom of Egypt, in scorn of the youth of the king and the sluggishness of his guardians;⁶ and he expected, by raising disputes about Hollow Syria,⁷ to have a cause for war and to wage it without obstacle while the Romans were busied with the Macedonian war; [6] however, for this war he had zealously promised everything to the senate through his envoys, and personally to the envoys of the senate. [7] Ptolemy because of his age was at that time still under the control of others; his guardians were both preparing war against Antiochus, in order to clear their title to Hollow Syria, and were promising the Romans everything for the war with Macedonia. [8] Masinissa was helping the Romans with grain and was preparing to send to the war troops with elephants under command of his son Misagenes. [9] However, he had plans ready for any outcome, and arranged as follows: if victory should be on the side of the Romans, [p. 377]then his own situation would remain unchanged,⁸ nor should he make any move to expand, for the Romans would not permit violence to be used against the Carthaginians; [10] if the powers of Rome, which then were sheltering the Carthaginians, should be broken, all Africa⁹ would be his. [11] Gentius, king of the Illyrians, did not so much determine which side he would favour, as succeed in becoming an object of suspicion to the Romans, and seemed to be about to join the one or the other through impulse more than reasoning.¹⁰ [12] The Thracian Cotys,¹¹ king of the Odrysae, secretly sided with Macedonia.