Delaroche's Execution of Lady Jane Grey: Royals to the slaughter

Why was this painting of Lady Jane Grey's beheading such a hit in 1830s France? Jonathan Jones on Delaroche's hidden agenda
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http://www.guardian.co.uk/artanddesign/2010/feb/24/delaroche-execution-of-lady-jane-grey


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http://en.wikipedia.org/wiki/Hippolyte_Delaroche