’Constantinian turn’ for the role of the bishop.

discuss the implications of the ’Constantinian turn’ for the role of the bishop. What is the origin of the ’bishop’; how did the office develop during the first centuries, and, most importantly, what kinds of functions did a bishop have before and after Constantine? Try to be concrete and give examples, with footnotes from Rousseau. In your answer, consider critically Rousseau’s take on the ’Constantinian turn’. In case you need another perspective, please have a look at the chapter on bishops in A Handbook on Late Antiquity (ch.35), or in the encyclopaedia The New Pauly.