Why is there a red dragon on the Welsh flag?

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Tags

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