In Eubœa an aristocracy or oligarchy of wealthy land-owners, who, from the cavalry which they maintained, were called _hippobotæ_, long prevailed in the two principal cities, Chalcis and Eretria. The great number of colonies which Chalcis sent out, and which attests its early importance, was probably the result of an oligarchical policy. Its constitution appears to have been, in proper terms, a timocracy: a certain amount of property was requisite for a share in the government. Eretria, once similarly governed, seems not to have been at all inferior in strength. She was mistress of several islands, among the rest of Andros, Tenos, and Ceos; and, in the days of her prosperity, could exhibit 600 horsemen, 3000 heavy-armed infantry, and 60 chariots in a sacred procession. Chalcis and Eretria were long rivals, and a tract called the Lelantian plain, which contained valuable copper mines, afforded constant occasion for hostilities. These hostilities were distinguished from the ordinary wars between neighbouring cities by two peculiar features--the singular mode in which they were conducted, and the general interest which they excited throughout Greece. They were regulated, at least in early times, by a compact between the belligerents, which was recorded by a monument in a temple, to abstain from the use of missile weapons. But, while this agreement suggests the idea of a feud like those which we have seen carried on, in an equally mild spirit, between the Megarian townships, we learn with surprise from Thucydides that the war between Eretria and Chalcis divided the whole nation, and that all the Greek states took part with one or the other of the rivals. It has been suspected that the cause which drew this universal attention to an object apparently of very slight moment was, that the quarrel turned upon political principles; that the oligarchy at Eretria had very early given way to democracy, while that of Chalcis, threatened by this new danger, engaged many states to espouse its cause. We are informed indeed that the Eretrian oligarchy was overthrown by a person named Diagoras, of whom we also hear that he died at Corinth while on his way to Sparta, and that he was honoured with a statue by his countrymen. It is also certain that the oligarchy at Chalcis, though more than once interrupted by a tyranny, was standing till within a few years of the Persian wars. But we do not know when Diagoras lived, and, without stronger evidence, it is difficult to believe that the revolution which he effected took place before the fall of the Athenian aristocracy, an epoch which appears to be too late for the war mentioned by Thucydides. THESSALY