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The president of Turkey on Friday formally converted Istanbul's sixth-century Hagia Sophia back into a mosque and declared it open for Muslim worship, hours after a high court annulled a 1934 decision that had made the religious landmark a museum.

The decision sparked deep dismay among Orthodox Christians. Originally a cathedral, Hagia Sophia was turned into a mosque after Istanbul's conquest by the Ottoman Empire but had been a museum for the last 86 years, drawing millions of tourists annually.

Turkey's high administrative court threw its weight behind a petition brought by a religious group and annulled the 1934 Cabinet decision that turned the site into a museum. Within hours, President Recep Tayyip Erdogan signed a decree handing over Hagia Sophia to Turkey's Religious Affairs Presidency.

In a televised address to the nation, Erdogan said the first prayers inside Hagia Sofia would be held on July 24, and he urged respect for the decision.

Erdogan had spoken in favor of turning the hugely symbolic UNESCO World Heritage site back into a mosque despite widespread international criticism, including from U.S. and Orthodox Christian leaders, who had urged Turkey to keep its status as a museum symbolizing solidarity among faiths and cultures.

The decision threatens to deepen tensions with neighboring Greece, whose culture minister, Lina Mendoni, denounced the move as "an open challenge to the entire civilized world that recognizes the unique value and universality of the monument."

In Paris, the United Nations cultural body, UNESCO, said it deeply regretted the decision.

"Its status as a museum reflects the universal nature of its heritage, and makes it a powerful symbol for dialogue," said Director-General Audrey Azoulay.

Some Islamic prayers have been held in the museum in recent years. In a major symbolic move, Erdogan recited the opening verse of the Quran there in 2018.

Built under Byzantine Emperor Justinian, Hagia Sophia was the main seat of the Eastern Orthodox church for centuries, where emperors were crowned amid ornate marble and mosaic decorations.

The minarets were added later and the building was turned into an imperial mosque following the 1453 Ottoman conquest of Constantinople — the city that is now called Istanbul.

The building opened its doors as a museum in 1935, a year after the Council of Ministers' decision.

Mosaics depicting Jesus, Mary and Christian saints that were plastered over in line with Islamic rules were uncovered through arduous restoration work for the museum. Hagia Sophia was the most popular museum in Turkey last year, drawing more than 3.7 million visitors.

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