What are the 4 classes of people in sumer?

In ancient Sumer, society was divided into four main classes: the ruling class, which included kings and priests; the upper class of wealthy merchants and landowners; the lower class of farmers and artisans; and the enslaved people who were often captured in warfare or born into servitude. The ruling class held significant power and influence, while the upper class contributed to the economy through trade. The lower class formed the backbone of agricultural production, and enslaved individuals had limited rights and were primarily forced to work for their masters. This hierarchical structure played a crucial role in the functioning of Sumerian civilization.