The Last Roman: Honour by Jack Ludlow
Justinian desperately wants the lost provinces returned to his rule but must first dispatch his brave general, Belisaurius to fight the Persians in the East. Justinian grows concerned that Belisaurius will grow successful and courageous in his feats, thus becoming a threat to his power and person. He subsequently dispatches him on a near-impossible mission to North Africa to take back from the Vandals what was once Ancient Carthage.