Hagia Sophia

Hagia Sophia is a former Eastern Orthodox patriarchal basilica, later a mosque, and now a museum in Istanbul, Turkey. From the date of its dedication in 360 until 1453, it served as the cathedral of Constantinople, except between 1204 and 1261, when it was converted to a Catholic cathedral under the Latin Patriarch of Constantinople of the Western Crusader established Latin Empire. The building was a mosque from 1453 until 1931, when it was secularized. It was opened as a museum in 1935.

Hagia Sophia in "The Emperor's Return"
On May 29, 1453, Emperor Constantine XI Palaiologos entered the Hagia Sofia as the Ottoman Empire overran Constantinople. After informing a priest that he would not flee, Constantine asked for a miracle: to let God see the city in Christian hands again.

With that, a mantle of flame bathed the emperor, and he sank into the marble floor before the eyes of the startled priest. Constantinople fell shortly after, and Constantine's body was never found.

One June 10, 2003, Constantinople was overrun by Greece during its war with Turkey. Four Greek soldiers entered the Hagia Sophia. With the city back in Christian hands, Constantine XI awoke from his slumber. Once he announced his intention to assert his rule again, Greek sergeant Yannis Pappas gunned the emperor down and left is body in the Hagia Sophia.