About the ecumenical councils that have been very important in the history of the Church. After the first conference of Christian believers, with the apostles, held in Jerusalem in the year 50 (or 49) led by Peter, there have been 21 ecumenical councils that have confirmed the faith of believers according to the teachings of the apostles, in the face of great reforms, in the history of the Catholic Church. They protected the rights of the people and maintained peace. These are the following, and the Pope who led them: 1) Nicaea I (325) Silvester I. 2) Constantinople I (381) Damascus. 3) Ephesus (431) Celestine I. 4) Chalcedon (451) Leo the Great. 5) Constantinople II (553) Vigilus. 6) Constantinople III (680-681) Agathon. 7)

Nicaea II (787) Adrian I. 8) Constantinople IV (869-870) Adrian II. 9) Lateran I - Rome (1123) Calista II. 10) Lateran II - Rome (1139) Innocent II. 11) Lateranez III - Rome (1179) Alexander III. 12) Lateranez IV - Rome (1215) Innocent III. 13) Lyon I (1245) Innocent IV. 14) Lyon II (1274) Gregory X. 15) Vienna - France (1311-1312) Clement V. 16) Constance (1414-1418) Antipope John XXIII, Martin V. 17) Basel-Ferrare - Florence (1431.1438-1445) Martin V, Eugene IV. 18) Latranez V - Rome (1512-1517) Julius II, Leo X. 19) Trent/Trento (22/05/1542. 1545-1563) Paul III, Julius III, Pio IV. 20) Vatican I - Rome (1869-1870) Pius IX. 21) Vatican II (25/01/1959. 11/10/1962 - 08/12/1965) John XXIII, Paul VI. The various councils have always stressed the importance of respect for sacred things and mutual respect, especially the preservation of life and the rules of conduct, according to the faith inherited from one another.