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Chronology
| 1864. | Dec. 6. | Pius IX first suggests a General Council. |
| 1865. | March. | Commission of Direction appointed; Letters sent to various Bishops. |
| 1866. | Dec. 8. | The Bishops are invited to meet in Rome, Dec. 8, 1867. |
| 1867. | June 26. | Pius IX announces to the Bishops his intention to hold a Council. |
| 1868. | June 29. | The Bull Æterni Patris summoning the Council for Dec. 8, 1869. |
| 1869. | Dec. 8. | First Session. |
| 1870. | April 24. | Third Session: Dogmatic Constitution on the Catholic Faith. |
| 1870. | July 18. | Fourth Session: Dogmatic Constitution on the Church of Christ. |
