What functions did the feudal lords perform in relation to the peasants?

Feudal lords distributed land, accepted taxes, conducted a trial, and so on. In fact, the feudal lords were full-fledged rulers in their land. We can say that they were petty kings in their domains. In almost every kingdom there were several powerful feudal lords who could argue with the king himself. Because of this, in such kingdoms, feudal wars very often took place, which led the state to fragmentation.