It was General Belisarius.
He was instrumental in helping Justinian in the campaign against the
Sassanids where he won a victory against them in the Battle of Darra and the
Battle of Callinicum during the Iberian War.
He then led a campaign against the Vandals where he won the Battle of Ad
Decimum and the Battle of Tricamarum. As
a result the enemy surrendered and lost Roman territories were given back to
the Byzantine Empire. He received many
honors for his success on this campaign. He also led a campaign against the Ostrogoths but had to be recalled back to deal with threats from the Persians who conquered Syria.
