The history of Nigeria can be traced to the earliest inhabitants whose remains date from at least 13,000 BC through early civilizations such as the Nok culture which began around 1500 BC. Numerous ancient African civilizations settled in the region that is known today as Nigeria, such as the Kingdom of Nri, the Benin Empire, and the Oyo Empire. Islam reached Nigeria through the Bornu Empire between and Hausa Kingdom during the 11th century, while Christianity came to Nigeria in the 15th century through Augustinian and Capuchin monks from Portugal to the Kingdom of Warri. The Songhai Empire also occupied part of the region. Through contact with Europeans, early harbour towns such as Calabar, Badagry and Bonny emerged along the coast after 1480, which did business in the transatlantic slave trade, among other things. Conflicts in the hinterland, such as the civil war in the Oyo Empire, meant that new enslaved people were constantly being "supplied".

The Kingdom of Nri was a medieval polity located in what is now Nigeria. The kingdom existed as a sphere of religious and political influence over a significant part of what is known today as Igboland prior to expansion, and was administered by a priest-king called an Eze Nri. The Eze Nri managed trade and diplomacy on behalf of the Nri people, a subgroup of the Igbo-speaking people, and possessed divine authority in religious matters.