What is the first Polyalphabetic cipher?

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  1. #substitution
  2. #cipher
  3. #vigen
  4. #though
  5. #simplified
  6. #example
  7. #based
  8. #alphabets
  9. #polyalphabetic
  10. #multiple
  11. #special
  12. #known
  13. #probably
  14. #using