Zamzam Well
Under al-Jannabi (ruled 923–944), the Qarmaṭians came close to raiding Baghdad in 927, and sacked Mecca and Medina in 930. In their attack on Islam's holiest sites, the Qarmatians desecrated the Zamzam Well with corpses of Hajj pilgrims and took the Black Stone from Mecca to al-Hasa. Holding the Black Stone to ransom, they forced the Abbasids to pay a huge sum for its return in 952.