Princess A is the anima of the hero. She rides—that is, possesses—the three-legged horse, who is the shadow, the inferior function-triad of her later spouse.
Jung identifies Princess A as the hero’s anima, demonstrating that she has seized control of his inferior psychological functions, establishing the structural relationship between anima, shadow, and the hero’s psychic development.
, The Archetypes and the Collective Unconscious, 1959thesis