You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: EUROPEAN PRINCESSES
Clue: On July 20, 1999 she gave birth to her fourth child, Princess Alexandra of Hanover
princess caroline of monaco

Category: LITERARY OPERAS
Clue: Operas based on this author's works include "Il Talismano", "Il Templario" & "La Prigione d'Edimburgo"
sir walter scott

Category: AMERICAN HISTORY
Clue: History was made on December 1, 1955 when bus driver James Blake called the police & had this person arrested
rosa parks