Kanem-Bornu Empire
There have been several major historical states in Nigeria that have influenced Nigerian society via their kings and their legal and taxation systems, and the use of religion to legitimize the power of the king and to unite the people. Northern Nigeria has been culturally influenced by Islamic influence including several major historic Islamic states in the region. The Kanem-Bornu Empire and the Sokoto Caliphate were major historical Islamic states in northern Nigeria. Southern Nigeria historically held several powerful states, including the Benin Empire and Oyo Empire, Ife Confederacy and several other Yoruba states.