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| House of Valentinian or House of Theodosius | 364 | 450 | Roman Empire | ||
| Huneric | 477 | 484 | Vandals | ||
| Ibrāhīm b. al-Walīd | 744 | 744 | Umayyads | ||
| Ilderic | 540 | 541 | Ostrogoths | ||
| Iudila | 631 | 633 | Visigoths | ||
| Joannes | 423 | 425 | Western Roman Empire | ||
| Joel | 525 | 575 | Aksumites | ||
| Jovian | 363 | 364 | Roman Empire | ||
| Jovinus | 411 | 413 | Western Roman Empire | ||
| Julian | 360 | 363 | Roman Empire | ||
| Julius Nepos | 474 | 475 | Western Roman Empire | ||
| Justin I | 518 | 527 | Eastern Roman Empire | ||
| Justin II | 565 | 578 | Eastern Roman Empire | ||
| Justinian I | 527 | 565 | Eastern Roman Empire | ||
| Justinian II (first reign) | 685 | 695 | Eastern Roman Empire | ||
| Justinian II (second reign) | 705 | 711 | Eastern Roman Empire | ||
| Kaleb | 520 | 540 | Aksumites | ||
| Kanik | 700 | 750 | Afrighids | ||
| Kawad I | 488 | 531 | Sasanians | ||
| Kawad II | 628 | 629 | Sasanians |