The territory of present-day Bayelsa State is the ancestral homeland of the Ijaw people, one of the largest ethnic groups in the Niger Delta. For centuries, Ijaw clans organised themselves into autonomous city-states and kingdoms centred on the creeks, rivers and mangrove swamps. Prominent pre-colonial polities included the Nembe Kingdom, Brass (Twon-Brass), Ogbia, and related clans such as Mein, Ekpetiama and Kolokuma.
These societies thrived on fishing, canoe-building, salt production and long-distance trade. From the 15th century onward they engaged European merchants in the palm-oil and later slave trade, with the Amanyanabo (traditional rulers) of Nembe and Brass playing key diplomatic and commercial roles. The riverine environment shaped a distinctive maritime culture that remains central to Ijaw identity.