XXIV. After the death of Aegeus, Theseus conceived a great and important
design. He gathered together all the inhabitants of Attica and made them
citizens of one city, whereas before they had lived dispersed, so as to
be hard to assemble together for the common weal, and at times even
fighting with one another.

He visited all the villages and tribes, and won their consent; the poor
and lower classes gladly accepting his proposals, while he gained over
the more powerful by promising that the new constitution should not
include a king, but that it should be a pure commonwealth, with himself
merely acting as general of its army and guardian of its laws, while in
other respects it would allow perfect freedom and equality to every one.
By these arguments he convinced some of them, and the rest knowing his
power and courage chose rather to be persuaded than forced into
compliance. He therefore destroyed the prytaneia, the senate house, and
the magistracy of each individual township, built one common prytaneum
and senate house for them all on the site of the present acropolis,
called the city Athens, and instituted the Panathenaic festival common
to all of them. He also instituted a festival for the resident aliens,
on the sixteenth of the month, Hekatombeion, which is still kept up. And
having, according to his promise, laid down his sovereign power, he
arranged the new constitution under the auspices of the gods; for he
made inquiry at Delphi as to how he should deal with the city, and
received the following answer:

"Thou son of Aegeus and of Pittheus' maid,
My father hath within thy city laid
The bounds of many cities; weigh not down
Thy soul with thought; the bladder cannot drown."