Louis XVII died in the Temple. All existing letters, dcumentation (and, now, scientific testing) point to that. Scientific testing proved Naundorff was an imposter. Eleazar Williams in Wisconsin has been proved an imposter. There is not a thread of evidence pointing to the survival of Louis XVII . At the time of her death in 1851, Marie Therese Charlotte, duchesse d'angouleme, named her nephew, the Comte de Chambord, her universal heir. Her brother was never mentioned in her July, 1851, testament. So, finally, after many years of doubt, she must have felt certain that her brother had died in 1795.