Mossi society is divided vertically into two major segments: the descendants of the horsemen who conquered the peoples on the Mossi plateau are called the "Nakomse", and all Mossi chiefs come exclusively from the "Nakomse" class. These people use figures as political art to validate their rule over the peoples they conquered. The descendants of the ancient farming peoples who had occupied the land from the beginning of time and who, by right of first occupation, were and are the owners of the land are called the "Tengabisi" (“people of the earth”). These Tengabisi can be further divided into groups of smiths ("Saya"), groups of traders ("Yarse") and, most important, groups of farmers ("Nyonyose"). Generally the smiths and the traders do not use masks, but the "Nyonyose" are the principal makers and users of masks in Mossi society.