Lastly, we have the development of a slave class, always the lowest class in any society. Slavery can have several definitions, but we will use Aristotle’s as a typical example.
“A slave is a living possession, who is by nature not his own but another’s and yet a man”
Slavery was a bi-product of the maturing human society and did not exist before man developed agriculture. The reason is a practical one in that nomadic tribes had no way to manage slaves while they were on the move. Without close management, slaves would attempt to escape whenever the opportunity arose.