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In page List of female hereditary monarchs:

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  • Oda of Tecklenburg (d. 1244), also known as Gertrude of Tecklenburg, Heiress of Rheda[1]
  • Olimpia Ludovisi, Princess of Piombino, 1699–1700[citation needed]
  • Olimpia Mancini (1639–1708), Countess of Soissons