Original: , and later definitions of an ecumenical council appear to conform to this sole biblical Council , no Christian church calls it a mere ecumenical council , instead it is called the '' Apostolic Council '' or '' Council of Jerusalem '' .
Simplified: The period of Christianity from the First Council of Nicaea (/O325/O) to the Second Council of Nicaea (/O787/O) is called the period of the Seven Ecumenical Councils .