The church, a monastery and other surrounding ruins have emerged from the sand over the past five years with the expansion of the airport serving the city of Najaf, and have excited scholars who think this may be Hira, a legendary Arab Christian center.

"This is the oldest sign of Christianity in Iraq," said al-Fatli, pointing to the ancient tablets with designs of grapes that litter the sand next to intricately carved monastery walls.

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Legend traces Christianity in Iraq to Thomas, one of the Twelve Apostles who fanned out to spread Christ's word after the Crucifixion.

Historians believe Hira was founded around 270 A.D., grew into a major force in Mesopotamia centuries before the advent of Islam, and reputedly was a cradle of Arabic script.

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Erica Hunter, a professor of early Christianity at London's School of Oriental and African Studies, says historical evidence shows that by the early third century, the faith was well established in what is now southern Iraq by the Lakhmid dynasty, an Arab kingdom whose final ruler converted to Christianity.

For centuries Hira was an important center of the Church of the East, sometimes known as the Nestorian church, whose modern offshoot, the Assyrian Church of the East, is still followed in Iraq. Hira, also called al-Hirah, lay near the Sea of Najaf, since vanished, and was renowned as an idyllic retreat.

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What is clear is that Christianity at Hira continued to thrive alongside Islam until at least the 11th century, hundreds of years after the Muslim conquest of the area.

"In fact Muslim historians talk of 40 monasteries in the vicinity of Hira," Hunter said in a telephone interview from London.

Eventually the region's Muslim rulers began persecuting the Christians, and Hira's churches were abandoned. Most remaining Iraqi Christians today are clustered in Baghdad, Mosul, Kirkuk and the self-ruled Kurdish north of Iraq.

Ruins a memento of Iraqi Christians' glorious past