Which socio enonomic class refers to the nobility among the catholic church of western europe

This term refers to a class of hereditary nobility in medieval Europe; a warrior class who shared a distinctive lifestyle based on the institution of knighthood, although there were social divisions within the group based on extremes of wealth.

For much of the Middle Ages, Popes were the last word in anything to do with the church.  Popes had a heavy influence over political and economic decisions as well for a time.  However, towards the end of the Middle Ages Popes lost their political power when the Catholic Church came under a lot of scrutiny from the public.

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a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."