Knights
Knights were given land by a lord in return for military service when demanded by the king. They were paid to fight for the lord and king and protect the lords family if the manor was under attack. The knights were allowed a certain area of land for personal use and distributed the rest to peasants. Knights often trained for years to become what they were. As a knight, it was your job to kill people so it was very difficult for knights to obey the church and the church's laws (You shall not murder). This annoyed the knights so they would constantly be looking for ways to do their job but not disobey the church. Although not as rich as the lords or nobles, knights were quite wealthy.