This article from the NY Times (registration req'd) profiles "Prince Charles Louis Edmond de Bourbon, count of Poitiers - or, for short, King Charles XII by Right, the legitimate heir to the French throne..." but.. since the DNA from this heart doesn't line up with his... it mustn't be the real thing...
http://www.nytimes.com/2004/06/08/in...pe/08pret.html