During the middle ages, many nobles willingly gave up their land to the church because at that time, the church was too powerful and did not pay any tax to the king for the land.
Also, a lot of people gave up land to raise money so they could join the Crusades.When nobles were killed in the Crusades, the kings would lay claim to their land. Over time, kings became very rich and more powerful.
As a result the Roman Catholic Church greatly increased in wealth, and the Pope became very powerful at the end of the Crusades. There was increased trade and transportation throughout Europe.
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