The Byzantine monument Hagia Sophia was originally known as the Great Church because of its great size compared to the other churches in the town.
It was later given the name of Hagia Sophia. The Church of Hagia Sophia is believed to have been erected by order of Constantine the Great. The Church was designed by the architects Isidoros and Anthemis and built in the amazingly short time of five years between 532 and 537 over the ruins of the ancient temple of Apollo in the Byzantine style.
The wonderful church, with its tremendous dome, is situated on a hill commanding an outstanding view of the Marmara Sea.