The twelve districts into which Cecrops had divided Attica were become so many nearly independent commonwealths, with scarcely any bond of union but their acknowledgment of one chief, whose authority was not always sufficient to keep them from mutual hostilities. The inconveniences of such a constitution were great and obvious, but the remedy full of difficulty. Theseus, however, undertook it; and effected that change which laid the foundation of the following glory of Athens, while it ranks him among the most illustrious patriots that adorn the annals of mankind. Going through every district, with that judicial authority which in the early state of all monarchical governments has been attached to the kingly office, and with those powers of persuasion which he is said largely to have possessed, he put an end to civil contest. He proposed then the abolition of all the independent magistracies, councils, and courts of justice, and the substitution of one common council of legislation, and one common system of judicature. The lower people readily acceded to his measures. The rich and powerful, who shared among them the independent magistracies, were more inclined to opposition. To satisfy these, therefore, he offered, with a disinterestedness of which history affords few examples, to give up much of his own power; and, appropriating to himself only the cares and dangers of royalty, to share with his people authority, honour, wealth, all that is commonly most valued in it. Few were inclined to resist so equitable and generous a proposal: the most selfish and most obstinate dared not. Theseus therefore proceeded quietly to new-model the commonwealth.[10]
The dissolution of all the independent councils and jurisdictions in the several towns and districts, and the removal of all the more important civil business to Athens, was his first measure. He wisely judged that the civil union, so happily effected, would be incomplete, or at least unstable, if he did not cement it by union in religion. He avoided however to shock rooted prejudices by any abolition of established religious ceremonies. Leaving those peculiar to each district as they stood, he instituted, or improved and laid open for all in common, one feast and sacrifice, in honour of the goddess Athene, or Minerva, for all inhabitants of Attica. This feast he called
A share in the legislature, extended to all, insured civil freedom to all; and no distinction prevailed, as in other Grecian provinces, between the people of the capital and those of the inferior towns; but all were united under the Athenian name in the enjoyment of every privilege of Athenian citizens. When his improvements were completed, Theseus, according to the policy which became usual for giving authority to great innovations and all uncommon undertakings, is said to have procured a declaration of divine approbation from the prophetical shrine of Delphi.
Thus the province of Attica, containing a triangular tract of land with two sides about fifty miles long, and the third forty, was moulded into a well-united and well-regulated commonwealth, whose chief magistrate was yet hereditary, and retained the title of king. In consequence of so improved a state of things, the Athenians began the first of all the Greeks to acquire more civilised manners. Thucydides remarks that they were the first who dropped the practice, formerly general among the Greeks, of going constantly armed; and who introduced a civil dress in contradistinction to the military. This particularity, if not introduced by Theseus, appears to have been not less early, since it struck Homer, who marks the Athenians by the appellation of long-robed Ionians. If we may credit Plutarch, Theseus coined money; which was certainly rare in Greece two centuries after.