Why was Hagia Sophia important to the Byzantine Empire?

The Hagia Sophia was of profound importance to the Byzantine Empire as the center of its religious, political, and artistic life for nearly a millennium.1

Commissioned by Emperor Justinian I and completed in 537 CE, it served as the cathedral of the Ecumenical Patriarchate of Constantinople. Its significance included:12

• Religious Authority: As the largest and most splendid cathedral in Christendom, it functioned as the heart of the Eastern Orthodox world. It established the pattern for the liturgical office, which was subsequently adopted throughout the Orthodox tradition.13
• Imperial Symbolism: The church represented the prestige of the imperial capital, "New Rome." It stood as a physical manifestation of the Byzantine ideology of a universal Christian society, where the empire and the church were led in a dyarchy.3
• Cultural Prestige: The structure was renowned for its architectural brilliance and beauty. Its influence was so great that it served as a cultural beacon, with its design and decoration setting standards for Byzantine art and architecture.32

For the Byzantine people, the Hagia Sophia was more than a building; it was a symbol of the empire's divine favor and cultural dominance.3