Why is the dragon on the Welsh flag?

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Tags

1. #included
2. #bosworth
3. #tudor
4. #which
5. #descent
6. #welsh
7. #state
8. #royal
9. #battle
10. #cathedral
11. #carried
12. #officially
13. #after
14. #henry
15. #recognised
16. #their
17. #signify
18. #dragon
19. #supporter
20. #national