The crowning achievement of Philopoemen’s career had been the uniting of Sparta to the Achaean league, after the murder of the tyrant Nabis by the Aetolians who had come to Sparta as his allies (B.C. 192). In B.C. 191 the Achaeans were allowed to add Messene and Elis to their league, as a reward for their services to Rome in the war against Antiochus. The Aetolian league, the chief enemy and opponent of Achaia, was reduced to a state of humble dependence on Rome in B.C. 189, after the defeat of Antiochus at Thermopylae (B.C. 191) and the Aetolian war (B.C. 191-189). From B.C. 190 then begins the time during which Polybius says that the “name of the Achaeans became the universal one for all the inhabitants of the Peloponnese” (2, 42). But though Sparta was included in the league she was always a restive and dissatisfied member; and the people of Elis and Messene, who were not very willing members either, were told by Flamininus that if they had any reason to complain of the federal government they were to appeal to him.[11] Now, by a treaty of alliance with Rome, decreed at Sikyon in B.C. 198, it was provided that Rome should receive no envoys from separate states of the league, but only from the league itself.[12] Flamininus, therefore, if he said what Livy reports him to have said, was violating this treaty. And this will be a good instance to illustrate the divisions of parties existing during the period of Polybius’s active political life (B.C. 181-169). We have seen that in B.C. 198 the Achaean league became an ally of Rome as a complete and independent state; that this state was consolidated by the addition of Sparta (192) and Elis and Messene (191) so as to embrace the whole of the Peloponnese; that its chief enemy in Greece, the Aetolian league, was rendered powerless in B.C. 189. The Macedonian influence in the Peloponnese had been abolished after the battle of Cynoscephalae (197) by the proclamation of Greek freedom by Flamininus (196). But all this seeming liberty and growth in power really depended upon the favour of Rome, and was continually endangered not only by the appeals to the Senate from separate states in the league, who conceived themselves wronged, but by treasonable representations of her own envoys, who preferred a party triumph to the welfare and independence of their country[13]. In these circumstances, there were naturally differences of opinion as to the proper attitude for the league government to assume towards a state, which was nominally an equal ally, but really an absolute master. There was one party who were for submissively carrying out the will of the Roman officers who from time to time visited the Peloponnese; and for conciliating the Senate by displaying a perpetual readiness to carry out its wishes, without putting forward in any way the rights which the treaty of 198 had secured to them. The leaders of this party, in the time of Philopoemen, were Aristaenos and Diophanes. The other