Question: Masjid al-Hisn was built by a caliph who ruled between what years ?
Sentence (from "Masjid al-Hisn"): 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.
Relevant evidence: Yes