I need help on The 21 Ecumenical Councils of the Catholic Church?

Question

I also need help in these 3 questions:

1. Where, when, and who convened each ecumenical council?
2. What were the decrees/results of each ecumenical council?
3. What heresies were involved in some of the ecumenical councils?

If anyone knows the answers to these questions, please help me out with this. Thanks!!!

Answer 1

An Ecumenical Council is a meeting of the bishops of the whole Catholic Church convened to discuss and settle matters of Church doctrine and practice.

There have been 21 Catholic Ecumenical Councils:

1. First Council of Nicaea, (325)
2. First Council of Constantinople, (381)
3. First Council of Ephesus, (431)
4. Council of Chalcedon, (451)
5. Second Council of Constantinople, (553)
6. Third Council of Constantinople, (680–681)
7. Second Council of Nicaea, (787)
8. Fourth Council of Constantinople, (869–870)
9. First Lateran Council, (1123)
10. Second Council of the Lateran, (1139)
11. Third Council of the Lateran, (1179)
12. Fourth Council of the Lateran, (1215)
13. First Council of Lyon, (1245)
14. Second Council of Lyon, (1274)
15. Council of Vienne, (1311–1312)
16. Council of Constance, (1414–1418)
17. Council of Basel, Ferrara and Florence, (1431–1445)
18. Fifth Council of the Lateran, (1512–1517)
19. Council of Trent, (1545–1563)
20. First Vatican Council, 1870
21. Second Vatican Council, (1962–1965)

This website describes the decrees, results and any heresies involved: http://www.piar.hu/councils/~index.htm

With love in Christ.

Answer 2

They were all man imposing his views onto the people in the name of God.

Answer 3

Here you go Whitepearls;
http://www.newadvent.org/cathen/04423f.htm