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| Uthman ibn Affan | 644 | 656 | Umayyads | ||
| Unknown Ikhshid (Wuzurg?) | 700 | 750 | Ikhshids of Sogdia | ||
| Unknown (Visigoth) | 438 | 710 | Visigoths | ||
| Unknown (Vandals) | 434 | 534 | Vandals | ||
| Unknown (Turkic) | 589 | 676 | Termezshahs | ||
| Unknown (Sogdian) | 479 | 750 | Sogdian | ||
| Unknown (Ikhshids) | 642 | 750 | Ikhshids of Sogdia | ||
| Unknown (Hephthalites) | 474 | 560 | Hephthalites | ||
| Unknown (Chagankhudat) | 580 | 800 | Chagankhudat | ||
| Unknown (Bukharkhudat) | 700 | 750 | Bukharkhudat | ||
| Unknown (Avars) | 567 | 822 | Avars | ||
| Unknown (Alchon) | 400 | 670 | Alchons | ||
| Unknown | |||||
| Uncertain (AD 260 - 402) | 260 | 402 | Roman Empire | ||
| ʿUmar b. ʿAbd al-ʿAzīz | 717 | 720 | Umayyads | ||
| Ukar (Urk Vartramuka) | 675 | 696 | Ikhshids of Sogdia | ||
| Turγar | 738 | 750 | Ikhshids of Sogdia | ||
| Tulga | 639 | 642 | Visigoths | ||
| Tukaspadak | 696 | 698 | Ikhshids of Sogdia | ||
| Totila | 542 | 552 | Ostrogoths |