Oyo Empire

The Oyo Empire was a Yoruba empire in West Africa. It was located in present-day western Nigeria (including the South West zone, Benin Republic, and the western half of the North Central zone). The empire grew to become the largest Yoruba-speaking state through the organizational and administrative efforts of the Yoruba people, trade, as well as the military use of cavalry. The Oyo Empire was one of the most politically important states in Western Africa from the late-16th to the early 18th century and held 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 on its west.

The legendary origins of the Oyo Empire lie with Ọranyan (also known as Ọranmiyan), the last prince of the Yoruba Kingdom of Ile-Ife (Ife). According to oral traditions, Ọranmiyan made an agreement with his brother to launch a punitive raid on their northern neighbors for insulting their father Oduduwa, the first Ooni of Ife. On the way to the battle, the brothers quarreled and the army split up. Oranmiyan's force was too small to make a successful attack, so he wandered the southern shore of the Niger River until reaching Bussa. There, the local chief entertained him and provided a large snake with a magic charm attached to its throat.

The chief instructed Oranmiyan to follow the snake until it stopped somewhere for seven days and disappeared into the ground. Oranmiyan followed the advice and founded Oyo where the serpent stopped. The site is remembered as Ajaka. Oranmiyan made Oyo his new kingdom and became the first "oba" (meaning 'king' or 'ruler' in the Yoruba language) with the title of "Alaafin of Oyo" (Alaafin means 'owner of the palace' in Yoruba). He left all his treasures in Ife and allowed another king to rule there.

At one time, Oyo-Ile was at war with the Bariba of Borgu, who wanted to subjugate the new city then still under construction. Orangun Ajagunla of Ila, Oranmiyan's elder brother, stormed in with his men to assist. Not long after the war was won, Oranmiyan had a son, Ajuwon Ajaka, by Princess Torosi of the Tapa (Nupe); much later Arabambi (Sango) was also born by the same woman. It is believed that the name "Sango" was given by his maternal grandfather or that he adopted it from the local name for the god of Thunder. Either way, the royal family was devoted to the Spirits of Thunder (Jakuta) and War (Ogun).

The founding of Oyo is regarded as 1300, but this is only estimated through backtracking the chronology.

Oranmiyan, the first oba (king) of Oyo, was succeeded by Oba Ajaka, Alaafin of Oyo. Ajaka was deposed, because he lacked Yoruba military virtues and allowed his sub-chiefs too much independence. Leadership was then conferred upon Ajaka's brother, Shango (also called Sango), who was later deified as the deity of thunder and lightning. Ajaka was restored after Sango's death. Ajaka returned to the throne thoroughly more warlike. His successor, Kori, managed to conquer the rest of what later historians would refer to as metropolitan Oyo.

Oyo had grown into a formidable inland power by the end of the 14th century. For over a century, the Yoruba state had expanded at the expense of its neighbors. During the reign of Onigbogi, Oyo suffered military defeats at the hands of the Nupe led by Tsoede. Sometime around 1535, the Nupe occupied Oyo and forced its ruling dynasty to take refuge in the kingdom of Borgu. The Nupe sacked the capital, destroying Oyo as a regional power until the early 17th century.

The Yoruba of Oyo went through an interregnum of 80 years as an exiled dynasty after its defeat by the Nupe. They re-established Oyo to be more centralized and expansive than ever. The people created a government that established its power over a vast territory.