Nri and Aguleri, where the Igbo creation myth originates, are in the territory of the Umeuri clan.
Members of the clan trace their lineages back to the patriarchal king-figure Eri.
Oyo, at its territorial zenith in the late 17th to early 18th centuries, extended its influence from western Nigeria to modern-day Togo.
The Edo's Benin Empire is located in southwestern Nigeria.
The British set up administrative and legal structures whilst practising indirect rule through traditional chiefdoms.