References: br 1. Historical Perspective, by Alexander Knysh, page 213br 2. Empire of the Mahdi by Heinz Halmbr 3. The Book of Government; or, Rules for Kings, by Niẓām al-Mulkbr 4. Al-Radd 'ala-I-Isma'iliyya by Ibn Rizambr 5. Interactions in The Islamic World: The Ismaili Thread, edited by Orkhan Mir-Kasimovbr br This is the story about how Abu Tahir al-Qarmati attacked Mecca and stole the Black Stone from the Kaaba.