 An African prefecture , centered in Carthage , was established in April 534 , but it would teeter on the brink of collapse during the next 15 years , amidst warfare with the Moors and military mutinies . The area was not completely pacified until 548 , but remained peaceful thereafter and enjoyed a measure of prosperity . The recovery of Africa cost the empire about 100 @,@ 000 pounds of gold . 
