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| House of Valentinian | 364 | 392 | Roman Empire | ||
| House of Theodosius | 378 | 455 | Eastern Roman Empire | ||
| House of Constantine or House of Valentinian | 337 | 383 | Roman Empire | ||
| House of Constantine (post Constantine) | 337 | 364 | Roman Empire | ||
| House of Constantine | 305 | 363 | Roman Empire | ||
| Hormizd | 479 | 490 | Sasanians | ||
| Honorius or Theodosius II | 395 | 450 | Roman Empire | ||
| Honorius | 395 | 423 | Western Roman Empire | ||
| Hishām b. ʿAbd al-Malik | 724 | 743 | Umayyads | ||
| Hilderic | 523 | 530 | Vandals | ||
| Hildeprand | 744 | 744 | Lombards | ||
| Hermenegild | 579 | 584 | Visigoths | ||
| Heraklonas | 641 | 641 | Eastern Roman Empire | ||
| Heraklios | 610 | 641 | Eastern Roman Empire | ||
| Herakalios Constantine/ Constantine III | 641 | 641 | Eastern Roman Empire | ||
| Heraclianus | 413 | 413 | African usurpers | ||
| Helena | 324 | 340 | Roman Empire | ||
| Hataz | 575 | 600 | Aksumites | ||
| Hannibalianus | 335 | 337 | Roman Empire | ||
| Gurak | 710 | 738 | Ikhshids of Sogdia |