Establish how the causes of the crusades and their composition are related?

The original (ideological) reason for the crusades was the liberation of the Holy Sepulcher from the hands of Muslims. But in the end, it turned into campaigns to seize lands. This goal was fully consistent with the composition of the troops of the Crusaders, who were well armed and equipped for the war. They were led by kings, counts, princes, who had a distant religious goal. They sought to seize land and wealth. In this connection, the crusades turned into bloody wars against Muslims.

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