The Akans consider themselves one nation. Akan means first, foremost, indicating the enlightened and civilized. While traditionally matrilineal, they are also united philosophically through 12 patrilineal spirit groups called the Ntoro or "egya-bosom." Within the Akan nation are branches based on many dialects, widest and possibly the oldest one being used is Twi. Each branch subsequently holds a collection of states and stemming from city-states. The state or "Aman" are typically ruled by several kings known as "Ahemfo". The state is the basic unit of Akan polity. Several states and city-states can band together to form a confederacy or an empire regardless of clan or abusua they belong to, while those outsides of the Akan tribe or the abusua were usually conquered or annexed via war or mutual agreement. For example, the Guan state of Larteh and the Akyem state of Akropong joined together to form the Akwapim Kingdom to avoid the Akwamu, who the Guan deemed as oppressive. Under the State there are Divisions and under these Divisions are towns and villages.