The Round Table was known as the order of chivalry for King Arthur's court. In order to become a knight in King Arthur's court, a man had to follow a strict code of honor and service. The expectations of a knight from Thomas Malory's Le Morte D'Arthur are listed here:
To not commit murder or violence
To not commit treason
To not be cruel but give mercy to those who ask for it
To help those in distress
To not be forceful
To not battle for love or material things