Hagia Sophia
Hagia Sophia was the third church built in this location. It was built between 532 and 537 as the cathedral of Constantinople, the capital city of the Eastern Roman Empire during Late Antiquity. Byzantine emperor Justinian the Great ordered the construction. The architects were Anthemius of Tralles and Isidore of Miletus. Greek historian Procopius wrote about Hagia Sophia's construction. The building's roof (a large dome) fell and had been rebuilt many times. An earthquake in 994 damaged the cathedral, it was rebuilt by Trdat the Architect.