All Ecumenical Councils Explained: Orthodox Catechism

Theologianspress.org 0:00 – First Ecumenical Council: Nicaea I (325) 22:55 – Second Ecumenical Council: Constantinople I (381) 43:29 – Third Ecumenical Council: Ephesus (431) 1:01:50 – Fourth Ecumenical Council: Chalcedon (451) 1:20:47 – Fifth Ecumenical Council: Constantinople II (553) 1:41:18 – Sixth Ecumenical Council: Constantinople III (680–681) 2:05:13 – Seventh Ecumenical Council: Nicaea II (787)