There are two kinds of Councils. General and Ecumenical Councils. Ecumenical means, I'm assured ,"Belonging to the whole inhabited world." (Dictionary.com.) Talking of the world as it was then thought to be, i.e. The Roman Empire. Ecumenical Councils have to be accepted or affirmed by the whole of the Church. General Councils are the ones,mainly ,that didn't receive that united acceptance ,after the fact. Such as Arles 314 A.D..