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| Sulaymān b. ʿAbd al-Malik | 715 | 717 | Umayyads | ||
| Suintila | 621 | 631 | Visigoths | ||
| Stephanos I | 590 | 627 | Guaramid dynasty | ||
| Sisenand | 631 | 636 | Visigoths | ||
| Sisebut | 612 | 621 | Visigoths | ||
| Sigismund | 516 | 523 | Burgundians | ||
| Sigibert III | 634 | 656 | Merovingians | ||
| Sigibert II | 613 | 613 | Merovingians | ||
| Sigibert I | 561 | 575 | Merovingians | ||
| Shapur III | 383 | 388 | Sasanians | ||
| Shapur II | 309 | 379 | Sasanians | ||
| Shapur I | 240 | 270 | Sasanians | ||
| Shaka | 305 | 335 | Kushanshahs | ||
| Severus III | 461 | 465 | Western Roman Empire | ||
| Sahrwaraz | 620 | 630 | Sasanians | ||
| Rothari | 636 | 652 | Lombards | ||
| Romulus Augustulus | 475 | 476 | Western Roman Empire | ||
| Romuald II | 706 | 732 | Lombards of Benevento | ||
| Roma | Roman Empire | ||||
| Rodoald | 652 | 653 | Lombards |