How is did Justinian make Constantinople a strong beautiful capital?

Justinian I transformed Constantinople into a magnificent capital through extensive architectural projects, most notably the construction of the Hagia Sophia, which showcased the empire's wealth and engineering prowess. He also fortified the city's defenses with massive walls, enhancing its security against invaders. Furthermore, he promoted arts and culture, leading to the development of mosaics and public buildings that reflected the grandeur of the Byzantine Empire. His reforms in administration and law helped establish a more efficient governance, contributing to the city's stability and prosperity.