A birthday crossword to keep you guessing

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Across
  1. 4. Cowards colour
  2. 6. A continent
  3. 11. Rebirth, new era
  4. 13. Loping gallery with seats for spectators
  5. 16. King of the Franks and Holy Roman Emperor
  6. 17. Mist, vapour, peasouper
  7. 19. A popular sport
  8. 20. Holy person
  9. 21. Natural stream
Down
  1. 1. Wax taper
  2. 2. Kate; before being tamed
  3. 3. Area, state, realm
  4. 5. Effervescent wine
  5. 7. Hallmark occasion
  6. 8. Body of water surrounded by land
  7. 9. Party, festival
  8. 10. Container that sounds nasty
  9. 12. Very old
  10. 14. Travel documentation
  11. 15. Cobalt
  12. 18. Horticultural area