 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.