eis zoarkeian
The offer of the metropolitan throne of a province was at times a form of retirement for prelates who had previously been patriarchs. The person awarded the title ‘eis zoarkeian’ (as a life support) was not a titular prelate, but actually the metropolitan of an active province and received the salary defined by the ecclesiastical law, without being obliged to be present there and perform his metropolitan duties.

exarch
At the Byzantine ecclesiastical administration the exarch, from the 5th century onwards, was the head of an ecclesiastical province and later became another title of the Ecumenical Patriarch, certifying that he was the head prelate within the jurisdiction of the Ecumenical Patriarchate. The office of exarch was abolished during the 6th century, although exarchs were metropolites or representatives of metropolites who supervised the ecclesiastical provinces or the ecclesiastical and monastic foundations. During the late 14th century as exarchs are referred the metropolites who were located at ancient dioceses and supervised all the ecclesiastical sees and the charitable institutions of the ecclesiastical province and later the authorized representatives of the Patriarch (patriarchal exarchs).