Trittys are groups of three Demes so each tribe consisted of nine Demes.
He also took Solon’s council of 400 and made it a council of 500 containing fifty representatives from each of the ten tribes. Members were chosen by lot making it the most democratic body possible.
These two great innovations created the political stability that would propel Athens forward for two hundred and fifty years. The new organization was a “democracy” because it gave direct power to the people through the assembly, and that power was greater than that held by the aristocratic families.