The Fulɓe of Fouta Djallonke spearheaded the expansion of Islam in the region. Fulɓe Muslim scholars developed indigenous literature using the Arabic alphabet. Known as Ajamiyya, this literary achievement is represented by such great poet-theologians as Tierno Muhammadu Samba Mombeya, Tierno Saadu Dalen, Tierno Aliou Boubha Ndyan, Tierno Jaawo Pellel etc. In its heyday, it was said that Fuuta-Jaloo was a magnet of learning, attracting students from Kankan to the Gambia, and featuring Jakhanke clerics at Tuba as well as Fulɓe teachers. It acted as the nerve centre for trading caravans heading in every direction. The more enterprising commercial lineages, of whatever ethnic origin, established colonies in the Futanke hills and along the principal routes. It served their interests to send their sons to Futanke schools, to support the graduates who came out to teach, and in general to extend the vast pattern of influence that radiated from Futa Jalon.