How successful was Justinian in achieving his military goals?

Justinian I was notably successful in achieving his military goals, particularly through his ambitious campaigns to reconquer lost territories of the Western Roman Empire. Under the leadership of General Belisarius, Justinian's forces reclaimed significant regions, including North Africa, parts of Italy, and southern Spain. However, these gains were often short-lived due to subsequent invasions and internal strife, leading to a mixed legacy in terms of lasting territorial control. Ultimately, while Justinian's military ambitions expanded the empire temporarily, the costs and challenges of maintaining these conquests proved to be significant.