This French king provides Dr Frank with a story that seems so unlikely that could it possibly be true. However, the entire story could be explained by a diagnosis of "madness", today that would be labelled as schizophrenia.
Medical Mysteries Series 5 - George Washington, and blood disorders
Medical Mysteries, Series 5 - Alexander Graham Bell, and anemia
Medical Mysteries, Series 5 - Jane Austen, and Addison's disease