First “feudalism” is a modern invention, a concept unknown to the people of the middle ages. If the Church blessed anything it was system of mutual obligation based not on force or blood ties but something like compact and even law. Remember that common law begins with Henry II, and that it owed much to the Church canon law as well as to the civil law. Magna carta did not come from nowhere but on the Church insistence that law came from the moral order of things, hat the Church was the proper judge of it but that all the social orders were bound to it, King, church, nobles and commons. That commons already include the self-ruling towns as well as the knights and squires.
Common law easily goes back to the code of Justinian.
Henry V used common law that dated back to the Salic Law to contest for the throne of France.
feu·dal·ism (fydl-zm)
n.
1. A political and economic system of Europe from the 9th to about the 15th century, based on the holding of all land in fief or fee and the resulting relation of lord to vassal and characterized by homage, legal and military service of tenants, and forfeiture.
2. A political, economic, or social order resembling this medieval system.
feudalism was no modern invention, though the word as a convenient shorthand for what was a complex web of relationships is more modern, say 1830-1840.