Pope Francis and the ‘Metropolitan Model’

What is a metropolitan archbishop, anyway, and how is the role feeding into Pope Francis' reforms?

Pope Francis’ motu proprio Vos estis lux mundi turns five years old this month. 

First promulgated for an experimental period of three years and now in permanent force, the letter delegates the Holy See’s power to investigate Church leaders who have no superior other than the Pope himself - chief among them diocesan bishops - to a metropolitan archbishop…