From the death of Xanthus, down to about 500 B.C., the constitution of Thebes continued rigidly aristocratical, having probably been guarded from innovation as well by the inland position of the city as by the jealousy of the rulers; and the first change, of which we have any account, was one which threw the government into still fewer hands. But, about the thirteenth Olympiad, it seems as if discontent had arisen, among the members of the ruling caste itself, from the inequality in the division of property, which had perhaps been increased by lapse of time, until some of them were reduced to indigence. Not long after that Olympiad, Philolaus, one of the Corinthian Bacchiads, having been led by a private occurrence to take up his residence at Thebes, was invited to frame a new code of laws; and one of the main objects of his institutions was to prevent the accumulation of estates, and to fix forever the number of those into which the Theban territory, or at least the part of it occupied by the nobles, was divided. He too was perhaps the author of the law which excluded every Theban from public offices who had exercised any trade within the space of ten years. It is probable enough that his code also embraced regulations for the education of the higher class of citizens; and it may have been he who, with the view, as Plutarch supposes, of softening the harshness of the Bœotian character, or to counterbalance an excessive fondness for gymnastic exercises, to which the Thebans were prone, made music an essential part of the instruction of youth. Our information on the other Bœotian towns is still scantier as to their internal condition; but we may safely presume that it did not differ very widely from that of Thebes, especially as we happen to know that at Thespiæ every kind of industrious occupation was deemed degrading to a freeman: an indication of aristocratical rigour which undoubtedly belongs to this period, and may be taken as a sample of the spirit prevailing in Bœotia. The Bœotian states were united in a confederacy which was represented by a congress of deputies, who met at the festival of the _Pambœotia_, in the temple of the Itonian Athene, near Coronea, more perhaps for religious than for political purposes. There were also other national councils, which deliberated on peace and war, and were perhaps of nearly equal antiquity, though they were first mentioned at a later period, when there were four of them. It does not appear how they were constituted, or whether with reference to as many divisions of the country, of which we have no other trace. The chief magistrates of the league, called _Bœotarchs_, presided in these councils, and commanded the national forces. They were, in later times at least, elected annually, and rigidly restricted to their term of office.