Origin of the word "Muggle"

[pippin_999]

No: HPFGUIDX 114228

My husband found this in "The Borders" a history of that region of 
Scotland by Alistair Moffat.
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Abbot Walter Bower, the author of the Scotichronicon, repeats a 
widely held belief that the English had tails and were blighted 
with them for showing disrespect to St Augustine and, later, to St 
Thomas a Becket. The tails were called 'muggles'.
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(The Scotichronicon is a 14th century work in Latin.)

My husband thought instantly of Dudley's tail.

Pippin