Banu Kalb
Palmyra prospered as part of the Umayyad Caliphate, and its population grew. It was a key stop on the East-West trade route, with a large "souq" (market), built by the Umayyads, who also commissioned part of the Temple of Bel as a mosque. During this period, Palmyra was a stronghold of the Banu Kalb tribe. After being defeated by Marwan II during a civil war in the caliphate, Umayyad contender Sulayman ibn Hisham fled to the Banu Kalb in Palmyra, but eventually pledged allegiance to Marwan in 744; Palmyra continued to oppose Marwan until the surrender of the Banu Kalb leader al-Abrash al-Kalbi in 745. That year, Marwan ordered the city's walls demolished.