Halfdan "Huitbein" OLAFSSON (King) (704 - ____)
Rognvald OLAFSSON (790 - 850)
Christian II OLDENBURG (King of Denmark) (____ - ____)
Christian III OLDENBURG (King of Denmark) (____ - ____)
Christian IV OLDENBURG (King of Denmark) (____ - ____)
Christian V OLDENBURG (King of Denmark) (____ - ____)
Christian VI OLDENBURG (King of Denmark) (____ - ____)
Christine OLDENBURG (Princess of Denmark) (____ - ____)
Frederik OLDENBURG (Crown Prince of Denmark) (____ - ____)
Frederik II OLDENBURG (King of Denmark) (____ - ____)
Frederik III OLDENBURG (King of Denmark) (____ - ____)
Frederik IV OLDENBURG (King of Denmark) (____ - ____)
Frederik V OLDENBURG (King of Denmark) (____ - ____)
Louise Charlotte OLDENBURG (Princess of Denmark) (____ - ____)
Ansfred II ONFROR GOZ (963 - ____)
Onwed (Onwydd) ONUM (____ - ____)
Anscario (Anchier) II ORCHERET (Count) (____ - 896)
Hadrian ORLEANS (____ - ____)
Amalasuntha OSTROGOTHS (526 - 535)
Athalaric OSTROGOTHS (King) (____ - ____)
Matasuntha OSTROGOTHS (____ - ____)
Ostrogotha OSTROGOTHS (____ - ____)
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