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How did the Hagia Sophia dome change after the earthquake of 558?
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Hagia Sophia
A bird's-eye view of Hagia Sophia on the shore of the Bosporus, Istanbul.
The earthquake of 558 caused a partial collapse of the original dome of the Hagia Sophia. Following this event, the dome was restored by 562.1
While the structure experienced two additional partial collapses in later centuries, it was eventually rebuilt to a smaller scale, and the entire church was reinforced from the outside to ensure its stability.1