[4] This square, where the public buildings stand, is divided into four quarters which are assigned as follows: one for the boys, another for the youths, a third for the grown men, and the last for those who are past the age of military service.

The law requires all the citizens to present themselves at certain times and seasons in their appointed places.

The lads and the grown men must be there at daybreak; the elders may, as a rule, choose their own time, except on certain fixed days, when they too are expected to present themselves like the rest.

Moreover, the young men are bound to sleep at night round the public buildings, with their arms at their side; only the married men among them are exempt, and need not be on duty at night unless notice has been given, though even in their case frequent absence is thought unseemly.

[5] Over each of these divisions are placed twelve governors, twelve being the number of the Persian tribes.