| OF WOODSTOCK, Eleanor Duchess of Guelders | | | | D. 22 APR 1355 |
| OF WOODSTOCK, Thomas 1st Duke Gloucester | | | | D. 9 SEP 1397 |
| OF YORK, Anne Duchess of Exeter | | B. 10 AUG 1439 | | |
| OF YORK, Constance , Countess Of Gloucestershire | | | | D. 28 NOV 1416 |
| OF YORK, Edmund Earl of Rutland | | B. 17 MAY 1443 | | D. 29 DEC 1460 |
| OF YORK, Isabel Countess of Essex | | B. 21 SEP 1409 | | D. 2 OCT 1484 |
| OF YORK, Richard 3rd Duke of York | | B. 21 SEP 1411 | | D. 30 DEC 1460 |
| OHENNA, Aeneas son of Fionn Mafionnloch | | | | |
| OHENNA, Fionn Mafionnloch | | B. ABT 212 BC | | D. ABT 178 BC |
| OILIOLLA, Cobthaigson of | | B. ABT 470 | | |
| OLA, Fiacha Fionn | | B. ABT 25 | | |
| OLAFSDOTTIR, Ingigerd | | B. AFT 1000 | | |
| OLLCHROTHACH, Una Ughna | | B. 98 | | D. 113 |
| ONBEKEND, Vrouw Van Tiberius Julius Lupus | | | | |
| ONIAS, Eleazer ben | | | | |
| ONIAS, Simon ben (Emporer "The Just") | | B. ABT 250 BC | | D. 291 BC |
| OR MELCHI BEN JANAI, Μελχί "MELHΙ" | | B. ABT 125 BC | | |
| ORFITUS, Aquilia spouse of Servius Cornelius Scipio Salvidienus | | B. ABT 110 | | |
| ORFITUS, Cornelius Cossonius Scipio | | B. 135 | | D. 192 |
| ORFITUS, Furia spouse of Marcus Maecius | | B. ABT 244 | | |
| ORFITUS, Marcus Gavius | | B. ABT 120 | | |
| ORFITUS, Memmius II | | B. 270 | | |
| ORFITUS, Servius Cornelius Scipio Orfitus Scipio Salvidenus | | B. 145 | | |
| ORFITUS HONORIUS, Gaius Memmius Vitrasius | | B. ABT 265 | | |
| ORLEANS, Aubri Gatinais and | | B. ABT 900 | | D. AFT 966 |
| ORLEANS, Geoffrey of | | B. ABT 825 | | D. AFT 942 |
| ORLEANS, Gunthar of | | B. 532 | | |
| ORLEANS DE CHARTRES, Rachel | | B. 879 | | |
| ORONTIDES, Aka II | | B. 29 | | |
| ORONTIDES, Akia | | | | |