Loígsech O'MOORE , King of Leix (____ - ____)
ONA (____ - ____)
ONCHU (____ - ____)
Cele O'NUALLAIN (____ - ____)
Máel Maud O'NUALLAIN (____ - ____)
Ivar OPLAENDINGE , Jarl of the Upplanders (____ - AFT. 790)
Eufrozyna of OPOLE (____ - 1293)
William_II of ORANGE (____ - ____)
William_III of ORANGE (1650 - 1702)
Marcus_I Antonius (The ORATOR) (____ - ____)
ORC (____ - ____)
ORDMAER (____ - ____)
Hakon Earl of ORKNEY (____ - 1126)
Hlodvir Earl of ORKNEY (____ - 0988)
Paul Earl of ORKNEY (____ - 1099)
Sigurd_II Earl of ORKNEY (____ - 1014)
Thorfinn_I Earl of ORKNEY (____ - AFT. 977)
Thorfinn_II Earl of ORKNEY (1009 - 1064)
ORLACAN (____ - ____)
Ermentrude of ORLÉANS (0825 - 0869)
Louis of ORLÉANS , Duke of Longueville (____ - 1537)
James Albert ORMSBY (____ - ____)
Myra Augusta ORMSBY (16 Jul 1866 - 28 Feb 1937)
Cynrik ab OSBORN (____ - ____)
Nest ferch OSBWRN (____ - ____)
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