The slaves were the largest strata, one at the bottom among the Soninke like other West African ethnic groups, and constituted up to half of the population. The slaves among the Soninke people were hierarchically arranged into three strata. The village slaves were a privileged servile group who lived apart from the village and took orders from the village chief. The domestic slaves lived in with a family and could not be sold. The lowest level among slaves were the trade slaves who could be bought and sold. With time, each of these strata became endogamous, states Daniel Littlefield – a professor of History.