The Byzantines under Belisarius defeated the Vandal King Gelimer at the Battle of Ad Decimum near Carthage, and began the "Reconquest of the West" under Byzantine Emperor Justinian I. Belisarius: Flavius Belisarius was a military commander of the Byzantine Empire under Emperor Justinian I. Belisarius was instrumental in the reconquest of much of the Mediterranean territory belonging to the former Western Roman Empire, which had been lost less than a century prior. He is considered one of the greatest military commanders of Byzantium and in history generally. September 13, 533. Wiki link