The Susu people, like other Manding-speaking peoples, have a caste system regionally referred to by terms such as Nyamakala, Naxamala and Galabbolalauba. According to David Conrad and Barbara Frank, the terms and social categories in this caste-based social stratification system of Susu people shows cases of borrowing from Arabic only, but the likelihood is that these terms are linked to Latin, Greek or Aramaic. The artisans among Susu people such as smiths, carpenters, musicians and bards (Yeliba), jewelers and leatherworkers are separate castes. The Susu people believe that these castes have descended from the medieval era slaves. The Susu castes are not limited to Guinea, but are found in other regions where Susu people live, such as in Sierra Leone where too they are linked to the historic slavery system that existed in the region, states Daniel Harmon. The Susu castes in the regional Muslim communities were prevalent and recorded by sociologists in late 19th and early 20th centuries. Temne people The Temne people are a West African ethnic group. They are predominantly found in the northwestern and central parts of Sierra Leone, as well as the national capital Freetown. Some Temne are also found in Guinea. The Temne constitute the largest ethnic group in Sierra Leone, at 35% of the total population. Temne society consists of patrilineal clans, is predominantly a mix of Muslim and polytheists, and some clans feature castes. The artisans and musicians in the Temne society have been endogamous caste people. The terminology of this social stratification system and the embedded hierarchy may have been adopted among the Temne from the nearby Mandinka people, Fula people and Susu people. The caste hierarchy and social stratification has been more well established in the northern Islamic parts of Temne territories. The endogamous slave castes were held in Temne clans as agriculture workers and domestic servants, and they formed the lowest subservient layer of the social strata. Enslaved women served as domestic workers, wives and concubines. Toucouleur people The Toucouleur people are a Muslim West African ethnic group found mostly in Futa Toro region of Senegal, with some in Mali and Mauritania. The Toucouleur embraced Islam in the 11th century, their early and strong Islamic heritage is a matter of great pride for them.Tukulor, Encyclopædia Britannica They have been influential in the spread of Islam to West Africa in the medieval era, later founded the vast Tukulor Empire in