 The president of each convocation as a whole and of the upper house is the archbishop of its province; each lower house elects for itself a president known as the prolocutor who is responsible for communication with the upper house.Until 1920, the upper houses had consisted of the diocesan bishops of the province and the lower houses were mainly composed of church dignitaries, the deans and archdeacons and one proctor representing each cathedral chapters and to these "ex officio" members were added in the case of Canterbury two representatives elected by the clergy of each diocese and in York two representatives from each archdeaconry.Today all diocesan bishops have a seat in their province's convocation; the suffragan bishops of a province elect a few from among themselves to join them.