Christine Beauchamp was the pseudonym of a woman, actually named Clara Norton Fowler, studied by American neurologist Morton Prince between 1898 and 1904.
[1] Beauchamp was a 23-year-old student who came to Prince, a Boston neurologist, because she was suffering from a "nervous disorder".
Prince was active in naming the personalities and in expressing a preference for one of them.
[2] Prince described Beauchamp as having three main distinct personalities, each of which had differing degrees of knowledge of the others.
[1]: 184, 185 He wrote: "although making use of the same body, each ... has a distinctly different character ... manifested by different trains of thought, ... views, beliefs, ideals, and temperament, and by different acquisitions, tastes, habits, experiences, and memories..."[1]: 1 This case was widely cited as the "prototypical case" of dissociative identity disorder, even into the 1970s.