Excerpts from Books and Wikipedia
"With Leontios at the helm the empire suffered the final loss of Carthage, its complete occupation by Arab forces, and the end of eight hundred years of Roman settlement in North Africa. The caliph al-Malik appointed an Arabic governor named Musa bin Nusair to rule the new Muslim province, Ifriqiya. And back in Constantinople, the general Leontios suffered the wages of defeat and was in turn overthrown. In 698, he was taken prisoner, mutilated, and sent to a monastery, and the army chose another soldier as emperor." [Bauer: Medieval World, p. 325]