Answer:
With the help of his famous general Belisarius Justinian managed to reconquer territories that were once part of Western Roman Empire, including Italy, North Africa and part of Spain. Once more he created a vast Empire that dominated the Mediterranean, but unluckily for the Empire it didn't last for a long period of time.
Step-by-step explanation:
When Justinian destroyed the Nica revolt he turned his attention towards the West. He ordered Belisarius to take back the territories that were once a part of great Roman Empire. Belisarius destroyed Kingdom of Vandals in North Africa and Kingdom of Ostrogoths in Italy. Byzantine Empire was at its peak.