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| Galla Placidia | 421 | 450 | Western Roman Empire | ||
| Garibald | 671 | 671 | Lombards | ||
| Gelimer | 530 | 533 | Vandals | ||
| Genseric | 428 | 477 | Vandals | ||
| Gersem | 600 | 614 | Aksumites | ||
| Gil Gavbara | 642 | 660 | Dabuyid dynasty | ||
| Gildo | 397 | 398 | African usurpers | ||
| Gisulf I of Benevento | 689 | 706 | Lombards of Benevento | ||
| Gisulf II | 742 | 751 | Lombards of Benevento | ||
| Glycerius | 473 | 474 | Western Roman Empire | ||
| Godepert | 661 | 662 | Lombards | ||
| Godomar | 523 | 532 | Burgundians | ||
| Gottschalk | 739 | 742 | Lombards of Benevento | ||
| Gratian | 367 | 383 | Roman Empire | ||
| Gregory (Lombard) | 732 | 739 | Lombards of Benevento | ||
| Gregory III | 731 | 741 | Papacy | ||
| Grimoald | 662 | 671 | Lombards | ||
| Gundemar | 610 | 612 | Visigoths | ||
| Gundobad | 473 | 516 | Burgundians | ||
| Gunthamund | 484 | 496 | Vandals |