| Oscar (Count of Wisborg) | (1859 - 1953) |
| Oscar | (1888 - 1958) |
| Oscar_I (King of Sweden) | (Jul 4, 1799 - Mar 8, 1844) |
| Oscar_II (King of Sweden) | (Jan 21, 1829 - Dec 8, 1907) |
| Oslac | (____ - ____) |
| Oswald of_Northumbria (King) | (____ - ____) |
| Other_issue | (____ - ____) |
| Otho_I the_Great (King of Germany) | (____ - ____) |
| Otho of_Montferrat (Marquis) | (____ - ____) |
| Otto | (____ - ____) |
| Otto_I (Emperor) | (____ - ____) |
| Otto of_Austria (Archduke) | (____ - ____) |
| Otto of_Saxony | (____ - ____) |
| Owain | (____ - 968) |
| Owain | (____ - 1275) |
| Owain Gwynedd | (____ - ____) |
| Patricia (Lady Ramsay) | (1886 - 1974) |
| Paul Frederick (Grand Duke) | (1800 - 1842) |
| Pauline of_Wurttemberg | (1800 - 1873) |
| Paul of_Yugoslavia (Prince) | (____ - ____) |
UP (Oscar -- Edward Balliol) | |
NEXT (Pedro_III of_Castile -- Philip_II ) | |