Tavistock Abbey was founded in 961 by Ordgar, Ealdorman of Devon, in the South West of England. Beyond this founding detail, the provided sources contain no specific information about a Norse raid on the monastery in 997. The event cannot be described in any reliable detail from the material available.
The only sourced detail relevant to Tavistock from these sources is that the abbey was established in 961, making it a relatively young institution at the time the raid is said to have occurred. No further detail about the raid itself is recorded in the provided sources.
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