Prince William died due to pilot error during an air-show.

 Holy Cross, Bobbington, Staffordshire
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The site of our first memorial to a prince.
 
 
 Prince William of Gloucester (William Henry Andrew Frederick; 18 December 1941 - 28 August 1972) was a member of the British Royal Family, a grandson of George V. He died due to pilot error during an air-show.
 
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