The Futa Jallon region of the modern state of Guinea (Conakry) has a rich and important history. It is the most mountainous area of the western Sudan and, indeed, it is in its hills that the two great rivers of West Africa – the Senegal and the Niger – have their source. The two dominant ethnic groups are the Fulbe and the various Mandinka groups known collectively as the Jallonke from whom the region gets its name. The Jallonke agriculturalists invaded and settled on the plateau of the Futa between the eleventh and thirteenth centuries. Between the fourteenth and sixteenth centuries animist Fulbe pastoralists followed but, preferring to graze their livestock on the higher hills, did not seriously clash with the Jallonke. In the seventeenth century Muslim Fulbe, coming from either Macina or the Futa Toro, defeated both the Jallonke and the animist Fulbe and imposed their suzerainty over the area exacting tribute and taking slaves from the defeated tribes. Despite their great numerical inferiority they succeeded in imposing themselves as the dominant political force in the region in the course of the century. A further grouping which deserves comment were the Jakhanke, a clerical group belonging to the Soninke people, who settled in the Futa in the eleventh century and founded the town of Touba which acquired a reputation as a centre for Islamic learning, attracting visitors from all over West Africa.