The point remains that 'Louis, Dauphin of France' is an unacceptable title for this person's article. What makes him The Dauphin? There were other Dauphin's named Louis - most notably the son of Louis XVI. I think that, if this person is never referred to as Louis-Ferdinand the Dauphin (since he does seem to be referred to as Louis-Ferdinand), the best title would be Louis, Dauphin of France (1732-1765), as User:Mcferran suggested.