Answer:
Feudalism was a set of legal and military customs in medieval Europe that flourished between the 9th and 15th centuries. It can be broadly defined as a system for structuring society around relationships derived from the holding of land, known as a fiefdom or fief, in exchange for service or labour.
Pope Urban the II promised people salvation for fighting in the Crusades ans since most people didn´t have access to a Bible, nor could read or write they believed him. They also believed him since he was the ¨Mouth Piece of God.¨
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The movement known as the Enlightenment focused on the idea that problems could be solved using human reason.