Rise and fall of Zhou

The Zhou king claimed to possess the mandate of heaven. According to this idea heaven gave power to the king or leader, and no one ruled without heaven's permission. If the king was found to be bad, heaven would support another leader.

What other ancient civilization is this like?

Social System

Kings
The king led the government and gave land to lords.


Lords and Warriors
Lords paid taxes to the king and provided warriors to protect his lands.


Peasants

Peasants: poor farmers with small farms.
Farmed the nobles' land. Each peasant recieved a small plot of land and had to farm additional land for the noble.


Book of Songs:
"Everywhere under the vast Heaven there is no land that is not the king's Within the borders of those lands There are none who are not the king's servants."


Who is missing from this Social System? Why do you think that is?