The nobles were the largest landowners in France, and their wealth was derived primarily from rents paid by peasants. These rents were often quite high, and they could provide the nobles with a substantial income.
Investments
The nobles also invested their money in a variety of businesses, such as banking, manufacturing, and trade. These investments could provide them with additional income, and they could also help to increase their social status.
Government positions
Many nobles held government positions, which could provide them with a salary and other benefits. These positions could also give them access to valuable information and resources, which could be used to further their own interests.
Marriage alliances
The nobles often married into other wealthy families, which could provide them with a significant financial boost. These marriage alliances could also help to strengthen the nobles' social and political power.
Church benefices
Many nobles were also members of the clergy, and they could receive income from church benefices such as bishoprics and abbeys. These benefices could provide the nobles with a substantial income, and they could also give them a great deal of influence within the church.