Tiberius III shi ne Sarkin Byzantine daga 15 Fabrairu 698 zuwa 10 Yuli ko 21 ga Agusta 705 CE.A cikin 696, Tiberius yana cikin rundunar da John Patrician ya jagoranta wanda Sarkin Ruma Leontios ya aiko don sake kwato birnin Carthage a cikin Exarchate na Afirka, wanda Larabawa Umayyads suka kama.Bayan da suka kwace birnin, sai sojojin Umayyawa suka kori su, suka koma tsibirin Karita;Wasu daga cikin hafsoshi, saboda tsoron fushin Leontios, suka kashe Yahaya suka naɗa Tiberius sarki.Tiberius ya tattara jiragen ruwa da sauri, ya tashi zuwa Konstantinoful, ya kori Leontios.Tiberius bai yi yunkurin kwato Afrika ta Byzantine daga hannun Umayyawa ba, amma ya yi yakin neman zabe a kan iyakar gabas da wasu nasarori.