| Agnes of ORREBY (ABT 1220 - ABT SEP 1300) |
| Fnu ORSBAN (____ - ____) |
| John ORSBAN (____ - ____) |
| Mickey ORSBAN (____ - ____) |
| Basilio ORSEOLO (____ - 1006/07) |
| Frozza ORSEOLO (1015 - 17 FEB 1070/71) |
| Giovanni ORSEOLO (____ - 1006/07) |
| Otto ORSEOLO (Doge of Venice) (ABT 992 - 1032) |
| Peter ORSEOLO (King of Hungary) (1011 - 30 AUG 1046) |
| Pietro II ORSEOLO (Doge of Venice) (961 - 1009) |
| Alfonsina ORSINI (1472 - 7 FEB 1519/20) |
| Bobone ORSINI (ABT 1048 - ABT 1106) |
| Bobone ORSINI (ABT 1100 - ____) |
| Camilla ORSINI (____ - ____) |
| Carlo ORSINI (____ - ____) |
| Clarice ORSINI (1450 - 1 AUG 1488) |
| Constanzo ORSINI (____ - ____) |
| Francesco ORSINI (____ - ____) |
| Gentile I ORSINI (1200 - 1246) |
| Giacinto ORSINI (ABT 1014 - ABT 1060) |
| Giacomo ORSINI (____ - ____) |
| Giangaetano ORSINI (ABT 1154 - AFT 1232) |
| Giovanni ORSINI (____ - ____) |
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