William O'NEAL -- to -- Oberto I OBERTENGHI (Margrave of Milan)
Otbert II OBERTENGHI (Margrave of Milan) -- to -- Ellen ODEN
Frances Ann ODEN -- to -- Edith ODGDEN
Catherine Elina ODOM -- to -- Theresia Maria Prinzessin of OETTINGEN-WALLERSTEIN
William OF AQUITAINE X -- to -- André OF BRIENNE (Lord of Ramerupt)
Erard OF BRIENNE I (Count of Brienne) -- to -- Emilde OF GéVAUDAN
Alan OF GALLOWAY -- to -- Marie OF LUXEMBOURG
Alberic OF MâCON II -- to -- Magdalena OF NASSAU
Maria OF NASSAU -- to -- Maria OF ORANGE-NASSAU
Maria OF ORANGE-NASSAU (Countess of Nassau) -- to -- Constance OF SICILY
Margaret OF SOLMS-BRAUNFELS -- to -- Ælfhelm OF YORK
Elizabeth OF YORK -- to -- Webb OLBON
Éléonore Marie Desmier of OLBREUSE -- to -- Anton I OLDENBURG (Count of Oldenburg)
Augusta of OLDENBURG -- to -- Christian IV OLDENBURG (Count of Oldenburg)
Christian IV OLDENBURG (King of Denmark) -- to -- Dorothea of OLDENBURG
Dorothea of OLDENBURG -- to -- Frederick VI OLDENBURG (King of Denmark, King of Norway)
Frederick VII Charles Christian OLDENBURG (King of Denmark) -- to -- Joachim Ernest OLDENBURG (Duke of Schleswig-Holstein-Sonderburg-Plön)
Johann OLDENBURG -- to -- Louise of OLDENBURG
Magdalene of OLDENBURG -- to -- Sophie Elisabeth of OLDENBURG
Sophie Hedevig of OLDENBURG -- to -- Salvador OLIVARES
Veronica OLIVARES -- to -- Anna of OLSHANSKY
Ivan OLSHANSKY -- to -- May OLSON
Randy OLSON -- to -- Vivian O. OPPENHEIMER

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