Our Fathers must hide themselves rather like robbers who chuse a leader, than godly priests who elect a mitred Abbot. […] And mark me, brother! not in the proudest days of the mitred Abbey, was a Superior ever chosen, whom his office shall so much honour, as he shall be honoured, who now takes it upon him in these days of tribulation.
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Mitred emissaries also passed from Gregory to the Emperor, summoning him to attend the diet within a time by which no one unwafted by wings or steam could have reached the place […]
Source: wiktionary
Their leaves were green when the Abbey rose in splendour, and mitred abbots walked in their shadow.
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Again I bestride the mitred, leather-winged steed.
Source: wiktionary