How do I unlock Greirat?

Related questions

1. What is a sacred oath?
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5. Where is the altar of sunlight?
6. What does tears of denial do?
7. What is a divine weapon in Dark Souls?
8. Where is the sunlight straight sword?
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Tags

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2. #someone
3. #grant
4. #firelink
5. #request
6. #teleport
7. #greirat
8. #brief
9. #deliver
10. #shrine
11. #unlock
12. #favor
13. #which
14. #certain
15. #refuse
16. #after
17. #agree
18. #accept
19. #prison
20. #approach