What was one main cause for the creation of manorialism?

Explanation:

Manorialism had its origins in the late Roman Empire, when large landowners had to consolidate their hold over both their lands and the laborers who worked them. This was a necessity in the midst of the civil disorders, enfeebled governments, and barbarian invasions that wracked Europe in the 5th and 6th centuries.

the noble might have thought that the system was far because they had lot of things and riches and the serf would have thought that the feudal system was un fair because of the way they were treated.