Final answer:
Justinian heavily invested in and rebuilt the city of Constantinople during his reign.
Step-by-step explanation:
During his reign, Justinian heavily invested in and rebuilt the city of Constantinople. He transformed it into a magnificent capital of the Byzantine Empire, filled with grand buildings and structures such as the Hagia Sophia. This investment was part of Justinian's efforts to revive the glory of the Roman Empire and solidify his power.
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