Woman resting on a sword

A picture of a female figure resting on a sword. May represent Saint Catherine of Alexandria.

http://www.nationalgallery.org.uk/cgi-bin/WebObjects.dll/CollectionPublisher.woa/wa/work?workNumber=ng4177

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http://www.tate.org.uk/servlet/ViewWork?cgroupid=999999961&workid=15713&searchid=14319&tabview=image