His palfrey was as broun as is a berye.
(= His riding-horse was as brown as a berry.)
A ‘palfrey’ was a horse for riding; it didn’t refer to a particular breed.
So whaddya think of the Monk? James Winny, in the Cambridge edition of The General Prologue, suggests that while Chaucer makes it clear that the Monk was a total failure in his vocation, Chaucer admired his vitality and merry attitude. It’s worth thinking about just how ironic Chaucer is being.
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