Canon 794

1. In a special case, the local hierarch can prohibit the marriage of the Christian faithful subject to him wherever they are

and also of other Christian faithful of his own Church sui iuris

actually present within the territorial boundaries of his eparchy, but only for a time, for a serious cause and as long as that

cause exists. 2. If the local hierarch is one who exercises

his power within the territorial boundaries of the patriarchal

Church, the patriarch can add an invalidating clause to a prohibition; in other cases only the Apostolic See can do so.