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| Raginpert | 701 | 701 | Lombards | ||
| Ratchis | 744 | 749 | Lombards | ||
| Reccared I | 586 | 601 | Visigoths | ||
| Recceswinth | 649 | 672 | Visigoths | ||
| Rechiar | 438 | 455 | Suevi | ||
| Redbad/Radbod | 680 | 719 | Frisians | ||
| Rhescuporis VI | 318 | 332 | Kingdom of Bosporos | ||
| Ricimer | 456 | 472 | Western Roman Empire | ||
| Roderic | 710 | 711 | Visigoths | ||
| Rodoald | 652 | 653 | Lombards | ||
| Roma | Roman Empire | ||||
| Romuald II | 706 | 732 | Lombards of Benevento | ||
| Romulus Augustulus | 475 | 476 | Western Roman Empire | ||
| Rothari | 636 | 652 | Lombards | ||
| Sahrwaraz | 620 | 630 | Sasanians | ||
| Severus III | 461 | 465 | Western Roman Empire | ||
| Shaka | 305 | 335 | Kushanshahs | ||
| Shapur I | 240 | 270 | Sasanians | ||
| Shapur II | 309 | 379 | Sasanians | ||
| Shapur III | 383 | 388 | Sasanians |