Final answer:
The major influence of Emperor Justinian and his general Belisarius was their military conquests, including the expansion of the Byzantine Empire and the reconquest of former Roman territories in the west.
Step-by-step explanation:
The major influence of Emperor Justinian and his general, Belisarius, was b. Military conquests, specifically the expansion and attempted reunification of the Roman territories. Under Justinian's reign, the Byzantine Empire expanded to its largest geographical extent, including the Balkans, north Africa, Italy, and parts of the eastern Mediterranean. Noteworthy was the reconquest of the western parts of the former Roman Empire from various Germanic kingdoms. Justinian was also known for imposing Christian unity, funding monumental architectural projects like the Hagia Sophia, and for his attempt to reimpose Roman law and traditions in the empire's territories.
Justinian and Belisarius's military campaigns were instrumental in reconquering the western provinces, especially Italy and parts of Spain, from the Germanic tribes. Belisarius, despite having a relatively small force, made significant progress in Italy, capturing key cities such as Rome, Milan, and Ravenna.
Their military efforts, however, were costly. While successful in asserting temporary control over these territories, the expense of such campaigns put a strain on the empire's economy, and after Justinian's death, many of the reconquered lands were eventually lost again to Germanic invasions and pressures from the east, particularly the Persian Empire.