West Africa sway not only over most of the other kingdoms in Yorubaland, but also over nearby African states, notably the Fon Kingdom of Dahomey in the modern Republic of Benin to the west. The Benin Empire was a pre-colonial empire located in what is now southern Nigeria. Its capital was Edo, now known as Benin City, Edo. It should not be confused with the modern-day country called Benin, formerly called Dahomey. The Benin Empire was "one of the oldest and most highly developed states in the coastal hinterland of West Africa, dating perhaps to the eleventh century CE". The Benin Empire
Dahomey was selected following his father's death after winning a succession struggle with a brother. King Agaja had significantly expanded the Kingdom of Dahomey during his reign, notably conquering Whydah in 1727. This increased the size of the kingdom and increased both domestic dissent and regional opposition. Tegbessou ruled over Dahomey at a point where it needed to increase its legitimacy over those who it had recently conquered. As a result, Tegbesu is often credited with a number of administrative changes in the kingdom in order to establish the legitimacy of the kingdom. The slave trade increased significantly during Tegbessou's reign