Gaius_II OCTAVIUS , Military Tribune in Sicily (____ - ____)
Gaius_III OCTAVIUS , Magistrate of Velitrae (____ - ____)
Gaius_IV OCTAVIUS , Senator of Rome (____ - ____)
ODA (____ - ____)
Jan ODEEN (____ - ____)
ODISSUS (____ - ____)
ODOMAR (____ - 0128)
Étan O'EAGRA (____ - ____)
Cynfarch OER , King of North Rheged (ABT. 460 - ____)
Margaret Louise "Peg" OERTEL (1921 - ____)
OFFA (____ - ____)
Cináed King of OFFALY (____ - 0829)
Conchobar King of OFFALY (____ - AFT. 891)
Finn King of OFFALY (____ - AFT. 928)
Flann King of OFFALY (____ - 0751)
Mugrón King of OFFALY (____ - 0782)
Ros Failge (Whence OFFALY) (____ - ____)
OGAMAN (____ - ____)
Aed OIRDNIDE , 164th Monarch of Ireland (____ - 0819)
Aed O'KELLY , King of Hy Maine (____ - ____)
Sadb O'KELLY (____ - ____)
Tadg O'KELLY (____ - 1014)
Cellach (whence O'KELLY) (AFT. 874 - ____)
OLAF (0391 - ____)
Ingigerd (Anna) OLAFSDOTTIR (ABT. 1001 - 10 Feb 1049)
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