What divided people into three classes?

People have historically been divided into three classes based on factors such as wealth, social status, and occupation. This tripartite division can often be seen in various societies, including the traditional feudal system, which categorized individuals into nobility, clergy, and peasantry. Such classifications influenced individuals' rights, privileges, and access to resources, shaping social hierarchies and interactions within communities. Economic disparities and cultural norms have perpetuated these divisions throughout history.