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| Aldfrith, king of the Northumbrians | 685 | 704 | English rulers | ||
| ʿAlī ibn Abī Ṭālib | 656 | 661 | Umayyads | ||
| Al-Walīd b. ʿAbd al-Malik | 705 | 715 | Umayyads | ||
| Amalaric | 522 | 531 | Visigoths | ||
| Amalasuntha | 534 | 535 | Ostrogoths | ||
| Anastasios I | 491 | 518 | Eastern Roman Empire | ||
| Anastasios II | 713 | 715 | Eastern Roman Empire | ||
| Ansprand | 712 | 712 | Lombards | ||
| Anthemius | 467 | 472 | Western Roman Empire | ||
| Arcadius | 395 | 408 | Eastern Roman Empire | ||
| Ardashir I | 224 | 240 | Sasanians | ||
| Ardashir II | 379 | 383 | Sasanians | ||
| Ardashir III | 629 | 630 | Sasanians | ||
| Arechis I | 591 | 641 | Lombards | ||
| Arioald | 626 | 636 | Lombards | ||
| Aripert I | 653 | 661 | Lombards | ||
| Aripert II | 701 | 712 | Lombards | ||
| Armah | 614 | 630 | Aksumites | ||
| Athalaric | 526 | 534 | Ostrogoths | ||
| Audelais | 732 | 732 | Lombards of Benevento |