Canterbury is the site of the head of the Anglican religion, and in addition to its temporal power, was considered holy because it was the site of Thomas a Becket’s martyrdom.  The monks of Canterbury harass Margery and accuse her of Lollardy.  The Archbishop of Canterbury, however, gives her her mantel and ring, sanctioning her chaste marriage.
Norwich was the head of the diocese to which Lynn belonged, so Margery made a number of pilgrimages there.  One of her confessors, Richard Caister, lived there, as did anchoress Julian of Norwich, whom Margery visited.
The bishop of Lincoln gives Margery money to buy white clothes, but also sends her to Canterbury for the Archbishop to examine. York was the 2nd most powerful ecclesiastical center in England (after Canterbury).  She spoke with many authorities in York, seeking their approval for her visions, and also defended herself capably against charges of heresy.