The first mosque ever built in Multan was the Jamia Mosque, constructed on the orders of Muhammad bin Qasim after the Umayyad general's conquest of the city in 712 AD. It stood on the western edge of the old fort at Qasim Bela — the bank of the river Chenab — and was for centuries the symbolic anchor of Islamic Multan, one of the earliest mosques in the entire subcontinent.
Nothing of the original building survives. Its ruins were still visible as late as 1954, when the encroaching channel of the Chenab finally washed away what was left of the foundations. The Qasim Bela area is now part of the protected old-fort precinct but the mosque itself is gone — a historical footnote rather than a site to visit.