Canon 18
On the gathering of the council.
We decree that a council shall be held in every province twice a year for the various ecclesiastical cares and solutions of the conflicts. The metropolitan bishop shall convoke all the bishops of the province in such way that also all presbyters, deacons and all those whose cases are to be examined for the just judgment on the council arrive, and if some bishops, presbyters, or deacons are found to be guilty of an offence, they shall be excommunicated according to their guilt provided that the council with the common consent does not decide to issue a more lenient sentence in their case. But no bishop except of those who are metropolitans shall make his own councils at his see.
(trans. M. Szada)