Answer:
For a person to be proclaimed Doctor of the Church, three requisites are necessary, according to Pope Benedict XIV's well-known definition:
- an eminent doctrine,
- a remarkable holiness of life and
- the declaration by the Supreme Pontiff or by a General Council which has met legitimately.
| 1-4. | Saints Ambrose, Jerome, Augustine, Gregory the Great | Boniface VIII, September 20, 1295 |
| 5. | Saint Thomas Aquinas | Saint Pius V , April 11, 1567. |
| 6-9. | Saints Athanasius, Basil, Gregory of Nazianzus, Saint John Chrysostom | Saint Pius V, 1568. |
| 10. | Saint Bonaventure | Sixtus V, March 14, 1588 |
| 11. | Saint Anselm of Canterbury | Clement XI, February 3, 1720. |
| 12. | Saint Isidore of Seville | Innocent XIII, April 25, 1722. |
| 13. | Saint Peter Chrysologus | Benedict XIII, February 10, 1729. |
| 14. | Saint Leo the Great | Benedict XIV, October 15, 1754. |
| 15. | Saint Peter Damian | Leo XII, September 27, 1828. |
| 16. | Saint Bernard of Clairvaux | Pius VIII, August 20, 1830. |
| 17. | Saint Hilaire of Poitiers | Pius IX, May 13, 1851. |
| 18. | Saint Alphonsus Liguori | Pius IX, July 7, 1871. |
| 19. | Saint Francis of Sales | Pius IX, November 16, 1871. |
| 20-21. | Saints Cyril of Alexandria and Cyril of Jerusalem | Leo XIII, July 28, 1882. |
| 22. | Saint John Damascene | Leo XIII, August 19, 1890. |
| 23. | Saint Bede the Venerable | Leo XIII, November 13, 1899. |
| 24. | Saint Ephrem of Syria | Benedict XV, October 5, 1920. |
| 25. | Saint Peter Canisius | Pius XI, May 21, 1925 |
| 26. | Saint John of the Cross | Pius XI, August 24, 1926. |
| 27. | Saint Robert Bellarmine | Pius XI, September 17, 1931. |
| 28. | Saint Albert the Great | Pius XI, December 16, 1931. |
| 29. | Saint Anthony of Padua | Pius XII, January 16, 1946 |
| 30. | Saint Laurence of Brindisi | John XXIII, March 19, 1959. |
| 31. | Saint Teresa of Avila | Paul VI, September 27, 1970. |
| 32. | Saint Catherine of Siena | Paul VI, October 4, 1970 |
| 33. | Saint Therese of Lisieux | John Paul II, October 19, 1997. |