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Joanna I of Castille Queen of Aragon || The sister of Catherine of Aragon, Joanna has gone down in history as Juana la Loca (Joanna the mad). She was Queen of Castile and Aragon, though she was prevented from ruling by the men in her life, her father, husband and son. When her sister, Isabella I died Juana would became. Queen of Castile. Both her husband, Philip and Juana's father, Ferdinand II wanted to control Castile. after her husbands death, her father took over regency of castile from juan