Why is there no dragon on the Union Jack?

Related questions

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2. What flag has a unicorn on it?
3. Why is the Scotland flag blue with a white cross?
4. Do the royals live in Buckingham Palace?
5. Can you fly three flags on one pole?
6. Do flagpoles need to be grounded?
7. What does the Red Dragon symbolize?
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10. Is Britain the same as UK?

Tags

1. #instead
2. #meant
3. #already
4. #union
5. #first
6. #england
7. #united
8. #kingdom
9. #wales
10. #century
11. #could
12. #appear
13. #principality
14. #created
15. #included
16. #welsh
17. #because
18. #dragon