<Ul> <Li> Structure </Li> <Li> Theology (History of theology) </Li> <Li> Liturgy </Li> <Li> Church history </Li> <Li> Holy Mysteries </Li> <Li> View of salvation </Li> <Li> View of Mary </Li> <Li> View of icons </Li> </Ul> <Li> Theology (History of theology) </Li> <Li> View of salvation </Li> <Li> View of Mary </Li>

In what year was the first ecumenical or worldwide council of the church