The most important element of Cleisthenes' reforms c. 508 BCE was to reorganize the citizen body of Athens. Traditional classifications and kin groups such as the four Ionian tribes were replaced in significance by a new classification where each member of the citizen body (demos) was to belong to one of 139 local units or demoi (demes). Demes, distributed all over Attica, then belonged to one of 30 trittyes, which, in turn, belonged to one of 10 tribes or phylai. Further, the three trittyes which made up a single tribe each had to come from one of three different areas of territorial classification (Coast, Inland, and City) so that it now became much less likely that tribes would act based on geographical and family loyalties.