1. The Ruling Class: This class included the king, his family members, and high-ranking officials such as priests, military commanders, and government administrators. They held significant power and influence in society and were responsible for making important decisions.
2. The Upper Class: Members of the upper class included wealthy landowners, merchants, and professionals such as doctors, architects, and engineers. They possessed considerable economic resources and enjoyed a comfortable lifestyle.
3. The Middle Class: This class consisted of skilled workers, such as craftsmen, artisans, and traders. They played a vital role in the economy by producing goods and facilitating trade.
4. The Working Class: The largest social class, the working class, included farmers, laborers, and servants. They performed manual labor and provided essential services to society.
5. The Lower Class: This class included slaves and indentured servants who had limited rights and were often treated as property. They were mainly used for labor-intensive tasks.
6. The Outcasts: The lowest social class included individuals who were considered impure, such as criminals, beggars, and disabled people. They were often excluded from society and lived on the fringes.
It's important to note that while these social classes were distinct, there was some degree of mobility between them. Skilled workers could rise in status through their achievements, and individuals from wealthy families could fall into poverty due to various circumstances. The social structure also varied across different periods of Sumerian history and in different city-states.