What does the flag of Galicia mean?

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Tags

1. #field
2. #galicia
3. #colours
4. #probably
5. #kingdom
6. #century
7. #based
8. #appeared
9. #flags
10. #popular
11. #andrew
12. #ancient
13. #white
14. #first
15. #originally
16. #medieval
17. #cross
18. #saints