| | | | | | DIOCLETIAN Iovius Western Emperor 286–305 | | Prisca | | | | Afranius Hannibalianus (disputed)[M 1] consul 292 | | Eutropia | | Maximian Herculius Western Emperor 286–305 |
| | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | |
Unknown sister | | Galerius Eastern Emperor 305-311 | | Galeria Valeria | | | | | | | Helena | | Constantius I Western Emperor 305–306 Constantinian Dynasty | | Flavia Maximiana Theodora | | | Severus II Western Emperor 306–307 |
| | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | |
Maximinus II Eastern Emperor 310–313 | | | | Valeria Maximilla | | Maxentius Western Emperor 306–312 | | Fausta | | Constantine I Roman Emperor 306–337 | | | | Julius Constantius consul 335 | | Flavia Julia Constantia | | Licinius I Eastern Emperor 308–324 | | | Martinian Western Emperor 324 | | | Valens I Western Emperor 316–317 |
| | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | |
| | | | | | | | Valerius Romulus | | Constantine II Emperor 337–340 | | Constantius II Emperor 337–361 | | Constans I Emperor 337–350 | | Julian II Emperor 361–363 | | | | Licinius II caesar |