Definitions for offa's dyke
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The Nuttall Encyclopedia
Offa's Dyke
an entrenchment and rampart between England and Wales, 100 m. long, extending from Flintshire as far as the mouth of the Wye; said to have been thrown up by Offa, king of Mercia, about the year 780, to confine the marauding Welsh within their own territory.
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