On July 10th, the BBC bannered "Hagia Sophia: Turkey turns iconic Istanbul museum into mosque" and reported that the biggest, oldest, and the most important, cathedral in all of Orthodox Christendom — and the world's most important Byzantine building, which was constructed as the Saint Sophia Cathedral by the Byzantine Roman Emperor Justinian I in Constantinople (now Istanbul) in the year 537, and which stands on the site that had been consecrated in the year 325 by the Roman Emperor Constantine (and which cathedral was relabelled the Hagia Sophia "museum" in 1935 by Turkey's Constitutionally secularist Government) — has now become, officially, at last, designated, by the restored Islamic Government of Turkey, a Muslim house of worship, a mosque, a Muslim house of worship.
This signals the end of Turkey's being ruled by a secular Government, which it had been, ever since 1923. It is the end of Turkey's secular Government and the restoration of the Islamic Mehmed the Conqueror's 1453 order that it be a mosque. That ended the Byzantine Roman Catholic Empire, and started Islamic-ruled Turkey. It ended Constantinople and started Istanbul. Mehmet, however, allowed Christianity to continue, in the Islamic Ottoman Empire, but only as an accepted part of the Greek East ("Orthodox"), not as part of the Roman West (imperialistic), Christianity (which he had just then conquered with the fall of Constantinople on that same date, 29 May 1453). And now, even the Orthodox Christians are being marginalized in Turkey, because the Hagia Sophia had been "for almost 1,000 years the most important Orthodox cathedral."