While all Greece, with the exception of Sparta, seemed hopelessly prostrate at the feet of Macedonia, a new political power, which sheds a lustre on the declining period of Grecian history, arose in a small province in Peloponnesus, of which the very name has been hitherto rarely mentioned since the heroic age. In Achaia, a narrow slip of country upon the shores of the Corinthian gulf, a league, chiefly for religious purposes, had existed from a very early period among the twelve chief cities of the province. The league, however, had never possessed much political importance, and it had been suppressed by the Macedonians. At the time of which we are speaking Antigonus Gonatas was in possession of all the cities formerly belonging to the league, either by means of his garrisons or of the tyrants who were subservient to him. It was, however, this very oppression that led to a revival of the league. The Achaean towns, now only ten in number, as two had been destroyed by earthquakes, began gradually to coalesce again; but Aratus of Sicyon, one of the most remarkable characters of this period of Grecian history, was the man who, about the year 251 B.C., first called the new league into active political existence. He had long lived in exile at Argos, whilst his native city groaned under the dominion of a succession of tyrants. Having collected a band of exiles, he surprised Sicyon in the night time, and drove out the last and most unpopular of these tyrants. Instead of seizing the tyranny for himself, as he might easily have done, Aratus consulted only the advantage of his country, and with this view united Sicyon with the Achaean league. The accession of so important a town does not appear to have altered the constitution of the confederacy. The league was governed by a STRATEGUS, or general, whose functions were both military and civil; a GRAMMATEUS, or secretary; and a council of ten DEMIURGI. The sovereignty, however, resided in the general assembly, which met twice a year in a sacred grove near AEgium. It was composed of every Achaean who had attained the age of thirty, and possessed the right of electing the officers of the league, and of deciding all questions of war, peace, foreign alliances, and the like. In the year 245 B.C. Aratus was elected STRATEGUS of the league, and again in 243. In the latter of these years he succeeded in wresting Corinth from the Macedonians by another nocturnal surprise, and uniting it to the league. The confederacy now spread with wonderful rapidity. It was soon joined by Troezen, Epidaurus, Hermione and other cities; and ultimately embraced Athens, Megara, AEgina, Salamis, and the whole Peloponnesus, with the exception of Sparta, Elis, and some of the Arcadian towns.