What was Pope Leo's role in the Crusades?

Related questions

1. Who was the first pope?
2. What is Protestant iconoclasm?
3. What was the first icon?
4. What is an iconoclast today?
5. What created the Great Schism?
6. What is an iconoclast person?
7. Who introduced iconography?
8. What caused Schism of 1054?
9. What does the term iconoclasm describe?
10. What was the icon controversy?

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20. #hungarians
21. #loyalty
22. #bishops