The ruler of slave society. Possession of means of production and slaves, cruel exploitation and oppression of slaves. The number of slaves is one of the main signs of slave owners' wealth.

The emergence of the slave-owning class is an inevitable phenomenon when human society develops to a certain stage. At the end of primitive society, with the improvement of productivity, the increase of surplus products and the development of exchange, clan dignitaries increasingly occupied property, herds and land, and some ordinary clan members gradually became poor and even became servants of clan dignitaries; At the same time, the prisoners in the war became the private property of the victors.