Councils, year it took place, convening pope(s) and number of bishops in attendence.

1. Nicaea I, 325; St. Sylvester I, 300 bishops

2. Constantinople I, 325; St. Damasus I, 150 bishops

3. Ephesus, 431; St. Celestine I, 150-200 bishops

4. Chalcedon, 451; St. Leo I, 600 bishops

5. Constantinople II, 553; Pope Vigilius, 165 bishops

6. Constantinople III, 680-681; St. Agatho, St. Leo II, 170 bishops

7. Nicaea II, 787; Pope Adrian, 300 bishops

8. Constantinople IV, 869-870; Pope Adrian II, 102 bishops

9. Lateran I, 1123; Pope Callistus II, 300 bishops

10. Lateran II, 1139; Pope Innocent II, 900-1,000 bishops

11. Lateran III, 1179; Pope Alexander III, 300 bishops

12. Lateran IV, 1215; Pope Innocent III

13. Lyons I, 1245; Pope Innocent IV, 150 bishops

14. Lyons II, 1274; Pope Gregory X, 500 bishops

15. Vienne, 1311-1312; Pope Clement V, 132 bishops

16. Constance, 1414-1418; Pope Gregory XII, Pope Martin V, 200 bishops

17. Florence (Basel-Ferrera-Florence-Rome), 1431-1445; Pope Eugene IV

18. Lateran V, 1512-1517; Pope Julius II, Pope Leo X

19. Trent, 1545-1563; Popes Paul III, Julius III, Pius IV

20. Vatican I, 1869-1870; Pope Pius IX, 800 bishops

21. Vatican II, 1962-1965; Pope John XXIII, Pope Paul VI, 2,860 bishops

National Catholic Reporter, Posted September 26, 2002

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