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Masjid al-Hisn ( Arabic: مسجد الحصن, "The Fortress Mosque") was built between 717 and 720 CE by the Umayyad caliph Umar II, as part of his conversion of Mopsuestia (in present-day southeastern Turkey) into a military base to shield Antioch from a potential Greek attack. ^[1]

A cistern within the structure was inscribed with Umar's full name, Umar ibn-'Abd-al-'Aziz. ^[1] The building fell into ruin during the reign of al-Mu'tasim, approximately 120 years later. ^[1]

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