Traditional rulers and scholars occupy important positions in the history of Islam in Nigeria in general and Osun State in particular. Although traditional rulers were not the earliest set of people that embraced Islam in Yorubaland as it was the case in Hausaland, evidence abound that some traditional rulers in Osun State were identified with the Islamic consolidation and implantation in their domains. They not only embraced the religion but they also contributed immensely to its spread. In the same vein, Islamic history in Osun State shows that some learned Islamic scholars, Imams and Sheikhs played pioneering role in the propagation and expansion of Islam in various Osun towns and cities. This book explores biographical history of selected Muslim traditional rulers and Islamic scholars/Imams/Sheikhs and their contributions to the development and expansion of Islam during their lifetimes.