Catalina de Erauso (in Spanish) or Katalina Erauso (in Basque), also known in Spanish as La Monja Alférez (English, The Nun Lieutenant) (San Sebastián, Spain, 1592 — Cuetlaxtla—near Orizaba—, New Spain, 1650), was a personality of the Basque Country, Spain and Spanish America in the first half of the 17th century. For nearly 400 years, the myth of Catalina Erauso has remained alive through historical studies, biographical stories, novels, movies and comics.

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