What were the social system of feudalism social classes? And what were their roles?

The social system of feudalism social classes is discussed below.

Explanation:

A feudal community has three separate social categories: a monarch, a royal family which could incorporate nobles, clergymen, and royalties and a worker or farmer level. Historically, the monarch reserved all the accessible property, and they portioned escape that property to his nobles for their control. The nobles, in accomplishment, leased out their property to farmers. In a feudal society, status is based on land ownership.

Depends at what decade because greek and liberal social systems were similar but different.

Proletariat is the working class and Bourgeoisie is the middle class that had enough money own land