Who gave out rewards for chivalrous deeds during medieval Europe?

by DnDTerror

In short: There is a group of people, who, without having a contract from the start, have slayed or captured bandits. Now they want a reward. In a city, who do they go to for such reward?

DnDTerror

I ask because similar situation has appeared in my Low Magic D&D game and I do not know what NPC to create. Thank you all for answers!