Olric Manfred II (Count di Suza) (____ - 23 DEC 1035)
Oneca (____ - ____)
Onmum (____ - ____)
Onnecas Inigo (Abt 830 - ____)
Ordgar (Earl of Devon) (____ - ____)
Ordono II (King of Leon) (Abt 872 - Abt 8 JUL 924)
Ordono III (King of Leon) (____ - 957)
Orio or Orieldis (____ - ____)
Ormele Gulden (____ - ____)
Osburh (Queen of Wessex) (Abt 810 - 846/852)
Osgod Clopa (____ - ____)
Oslac (Ealdorman) (____ - ____)
Ostrida of Gothland (____ - ____)
Otho (Ct.of Vermandois) (Abt 1000 - 25 MAY 1045)
Otto (Ct. of Maurienne) (____ - ____)
Otto (Dk. of Carinthia) (____ - 1004)
Otto I "the Great" (Holy Roman Emp'r) (23 NOV 912 - 7 MAY 973)
Otto I the Illustrious (Duke of Saxony) (828 - Abt 912)
Otto II (Emp. of Germany) (955 - 7 DEC 983)
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