Persons (1293 to 1317 of 1956)
| Name | Birth (min–max) | Death (min–max) | Related sources | Authored diagrams | |
|---|---|---|---|---|---|
| Ochmański, Jerzy W. | 1 | 0 | |||
| of Alexandria, Stephanus | 520–580 | 590–650 | 1 | 0 | |
| of Auxerre, Lambert | 2 | 0 | |||
| of Lucca, William | 1100–1140 | 1178 | 1 | 0 | |
| of Saint Thomas, John | 1589 | 1644 | 4 | 0 | |
| of Sherwood, William | 1200–1205 | 1266–1272 | 5 | 10 | |
| of Trebizond, George | 1394–1398 | 1472–1484 | 14 | 10 | |
| Ogiermann, Eva | 1 | 0 | |||
| Ojeda-Aciego, Manuel | 4 | 0 | |||
| Olmos, Ivan | 1 | 0 | |||
| Olsen, Elizabeth Grace | 1 | 0 | |||
| Ong, Walter J. | 1 | 0 | |||
| Oostra, Arnold | 1 | 0 | |||
| Oporinus, Johannes | 1 | 0 | |||
| Orbellis, Nicolaus de | 2 | 0 | |||
| Orciuoli, Francesco | 4 | 11 | |||
| Orenstein, Alex | 1936 | 2018 | 3 | 0 | |
| Oresme, Nicole | 3 | 0 | |||
| Ortiz, Didacus | 4 | 6 | |||
| Osorio, Mauricio | 1 | 0 | |||
| Otten, Petrus | 0 | 0 | |||
| Paasch, JT | 1 | 0 | |||
| Pabijutaitė, Živilė | 1 | 0 | |||
| Paganus, Theobaldus | 1 | 0 | |||
| Page, Martinus | 1761 | 3 | 3 |