The highest status among the five Toucouleur castes is of the aristocratic leaders and Islamic scholars called "Torobe". Below them are the "Rimbe", or the administrators, traders and farmers. The "Nyenbe" are the artisan castes of the Toucouleur society. The fourth caste strata is called the "Gallunkobe" or the slaves or descendants of slaves "who have been freed". The bottom strata among the Toucouleurs are the "Matyube" or slaves. The slaves were acquired by raiding pagan ethnic groups or purchased in slave markets, or the status was inherited.