Which class of people earned fine houses and lands to rule in exchange for their service?

Warriors

Explanation:

In a feudal system, the resources in a certain country are owned by several people known as 'Lords'.

Often time, these lords involved in conflict with one another, to the point where they have to form their own army to fight one another. The army that the lords gathers is what considered to be the people from  warrior class.

In some cases, there were several men from the warriors class. who have proof their loyalty to one lord and contributed greatly to the lord's victories in the conflict. As a sign of gratitude, the Lords often gave such men fine houses and lands to rule in exchange for their service.

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