Zamzam Well
The Ismaili Shia sect known at the Qarmatians seized Bahrain in 899 AD, making it their stronghold and base of operations. They raided Baghdad and in 930 sacked Mecca and Medina, desecrating the Zamzam Well with the bodies of Hajj pilgrim and taking the Black Stone with them back to Bahrain where it remained for twenty years. The Qarmatians were eventually defeated by their Ismaili counterparts, the Abbasids in 976 and afterwards their power waned.