Will mark brainilest
who were the main participants and what was the primary reason for the first crusade?

The main participants of the First Crusade were formed by many belligerent kingdoms. I believe that we can separate them into the Papal States, the Kingdom of France, the County of Flanders, and the Holy Roman Empire. The primary reason was to free the Holy Land, however, there were political and economical reasons behind this Pope decision.

Explanation:

The reason for the first crusade was to free the "Holy Land" from musIim command and I believe the main participants were from France.

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