it didnt.
Feudalism is the structure of the government and part of the society. It is not a separate thing so in asking this question you are asking about a system that the knights were part of and created. Knights were nobles and a different class of people and were created because of feudalism.
Feudalism was a national economic organizational system. Anyone who lived in a feudal society contributed to feudalism in the same way that anyone who lives in a capitalist society contributes to capitalism.
Feudalism
Their society soon became organized. Feudalism also benefited politically and economically
Feudalism let everyone know what their place was in society. It provided certainty in life and ensured everyone understood what their job was and who they served.
feudalism
This is a feudal society that you ask about.
Charlemagne did not bring feudalism to Europe. He did bring a series of changes that improved feudal society at this time.
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They helped cause the rise of feudalism
The nobles ruled the society and created the laws.
Feudalism existed in Medieval European society. The King appointed a Lord to oversee a property. The Lord relied on commoners, or serfs, to work the land while he provided for them.