take its first step towards embracing all the Peloponnese. It seems that for five years Aratus remained chief magistrate of Sicyon, but a private citizen of the league. In B.C. 245 (though of the exact year we have no positive information), he appears to have been first elected Strategus of the league. But it was not until his second year of office, B.C. 243-242, that he began putting in practice the policy which he proposed to himself,—the expulsion of the Macedonian garrisons and the despots from the cities of the Peloponnese, with the view of their joining the league. He began with the Acrocorinthus. Corinth, freed from the foreign garrison, joined the league, and was followed soon after by Megara[118] (B.C. 240). From this time Aratus was Strategus of the league in alternate years to the time of his death, the federal law not allowing two consecutive years of office.[119] [Sidenote: Cleomenic war, B.C. 227-221.] [Sidenote: B.C. 226-221.] The death of Antigonus Gonatas (B.C. 239) led to a new departure. Hitherto the Aetolians had been in league with the Macedonians to vex and harry the Achaeans. The two leagues now made peace, and the Aetolians aided the Achaeans in their resistance to Gonatas’s successor, Demetrius (B.C. 239-229). Still the despots in many of the Peloponnesian towns held out, trusting to the support of Demetrius. When he died (B.C. 229) there was a general movement among them to abdicate and join their cities to the league. Lydiades of Megalopolis had done so during Demetrius’s lifetime; and now Aristomachus of Argos, Xeno of Hermione, and Cleonymus of Phlius did the same. The rapid extension of the Achaean league, however, could not fail to excite the jealousy of the Aetolians, to whose league belonged certain Arcadian cities such as Mantinea, Tegea, and Orchomenus. These they imagined to be threatened by the policy of Aratus, which was apt to proceed on the line that even a forcible attachment of a Peloponnesian town to the league was in reality a liberation of its people from a constraining power. The Spartan jealousy was aroused by the same fear. And then, as Polybius puts it, the Aetolians connived at the extension of Spartan power, even at the expense of cities in league with themselves, in order to strengthen Cleomenes in his attitude of opposition to the Achaeans.[120] Aratus, however, resolved to wait for some definite act of hostility before moving. This was supplied by Cleomenes building a fort (the Athenaeum) at Belbina, in the territory of Megalopolis, a league city. Upon this the league necessarily proclaimed war with Sparta. Thus does Polybius, a warm friend of the league, state the case in its behalf. The league, he argues, had been growing by the voluntary adherence of independent towns: it had shown no sign of an intention to attack Laconian territory, or towns in league with Aetolia: while Cleomenes had committed an act of wanton aggression and provocation by building a hostile fort in its territory.