What are the ecumenical councils of the Catholic Church?

Answer:
The Catholic Church has had 21 ecumenical councils:
  1. First Council of Nicaea
  2. First Council of Constantinople
  3. Council of Ephesus
  4. Council of Chalcedon
  5. Second Council of Constantinople
  6. Third Council of Constantinople
  7. Second Council of Nicaea
  8. Fourth Council of Constantinople
  9. First Council of the Lateran
  10. Second Council of the Lateran
  11. Third Council of the Lateran
  12. Fourth Council of the Lateran
  13. First Council of Lyon
  14. Second Council of Lyon
  15. Council of Vienne
  16. Council of Constance
  17. Council of Florence
  18. Fifth Council of the Lateran
  19. Council of Trent
  20. First Vatican Council
  21. Second Vatican Council
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