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| Constantine I or Tetrarchy | 284 | 337 | Roman Empire | ||
| Constantine II | 337 | 340 | Roman Empire | ||
| Constantine III | 407 | 411 | Western Roman Empire | ||
| Constantine IV | 668 | 685 | Eastern Roman Empire | ||
| Constantine V | 741 | 775 | Eastern Roman Empire | ||
| Constantinopolis | Roman Empire | ||||
| Constantius Gallus | 351 | 354 | Roman Empire | ||
| Constantius II | 337 | 361 | Roman Empire | ||
| Constantius II or Constans | 337 | 361 | Roman Empire | ||
| Constantius II or Julian II | 337 | 363 | Roman Empire | ||
| Constantius III | 421 | 421 | Western Roman Empire | ||
| Crispus | 316 | 326 | Roman Empire | ||
| Cunimund | 560 | 567 | Gepids | ||
| Cunincpert | 688 | 700 | Lombards | ||
| Dabuya | 660 | 712 | Dabuyid dynasty | ||
| Dadhburzmihr | 728 | 741 | Dabuyid dynasty | ||
| Dagobert I | 623 | 638 | Merovingians | ||
| Dagobert II | 676 | 679 | Merovingians | ||
| Dagobert III | 711 | 715 | Merovingians | ||
| Dalmatius | 335 | 337 | Roman Empire |