List of Female Rulers and Title Holders - O

O

• • Oda of Altena, Regent Countess of Tecklenburg, 1202–1206, for her son Otto (d.1263)
  • Oda of Hornes, Countess of Hornes
  • Oda of Tecklenburg (d.1244), also known as Gertrude of Tecklenburg, Heiress of Rheda
  • Olimpia Ludovisi, Princess of Piombino, 1699–1700
  • Olimpia Mancini (1639–1708), Countess of Soissons
  • Onna of Esens, Heiress of Esens, Wittmund and Stedesdorf