Apparently the mound used to be surrounded by water.... so maybe the island would have been noticeable and important before it was resculpted for castley purposes. Ooh could it have looked like silbury surrounded by its moat? er I may be getting far too carried away now. But you'd think there might have been a bump there before the castle becuase it would make less work to build up.
From the record on 'magic':
http://www.magic.gov.uk/rsm/13334.pdf
"While the bailey is located on a natural ridge of boulder clay, during
the Middle Ages the motte stood on an island of sand and gravel within a lake known as Skipsea Mere. The mere was drained in c.1720 and the resultant reclaimed land allotted to various owners."
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