structural:expansion, linguistic:voice_change
Islam

Islam came into Yorubaland around the 14th century, as a result of trade with Wangara (also Wankore) merchants, a mobile caste of the Soninkes from the then Mali Empire who entered Yorubaland (Oyo) from the northwestern flank through the Bariba or Borgu corridor, during the reign of Mansa Kankan Musa. Due to this, Islam is traditionally known to the Yoruba as Esin Male or simply Imale i.e. religion of the Malians. The adherents of the Islamic faith are called Musulumi in Yoruba to correspond to Muslim, the Arabic word for an adherent of Islam having as the active participle of the same verb form, and means "submitter (to Allah)" or a nominal and active participle of Islam derivative of "Salaam" i.e. (Religion of) Peace. Islam was practiced in Yorubaland so early on in history, that a sizable proportion of Yoruba slaves taken to the Americas were already Muslim.

The mosque served the spiritual needs of Muslims living in Ọyọ. Progressively, Islam started to gain a foothold in Yorubaland, and Muslims started building mosques. Iwo led, its first mosque built in 1655, followed by Iseyin in 1760, Eko/Lagos in 1774, Shaki in 1790, and Osogbo in 1889. In time, Islam spread to other towns like Oyo (the first Oyo convert was Solagberu), Ibadan, Abẹokuta, Ijebu Ode, Ikirun, and Ede. All of these cities already had sizable Muslim communities before the 19th century Sokoto jihad.