girl. See also Qavurt, brother-in-law of caliph Al-Qa'im Avicenna also known as Ibn Sina was a polymath, physicians, astronomers, thinkers and writers. Fakhr ad-Dawla ibn Jahir, vizier under al-Qa'im Abu Mansur ibn Yusuf, prominent Baghdad merchant and confidential adviser of al-Qa'im Notes References Sources This text is adapted from William Muir's public domain, The Caliphate: Its Rise, Decline, and Fall.'' 1001 births 1075 deaths 11th-century Abbasid caliphs Sons of Abbasid caliphs 11th century in Iraq 11th-century Arabs