Astrologers predicted that the expected child of King Gustav II Adolf and Queen Marie Eleanore would be a boy. However, they were proven wrong when a daughter, Kristina was born. Nevertheless, the infant`s father declared that she would be reared in the manner accorded a prince and would succeed him as king. The diary of Kristina, The Girl King explores the strong character she developed, while it delves into the complexities of her relationship with family and counselors inside the monarchy she inherited at age six.