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The 9th century was a period from 801 (DCCCI) through 900 (CM) in accordance with the Julian calendar. The field of algebra was founded by the Muslim polymath Al-Khwarizmi. The most famous Islamic Scholar Ahmad ibn Hanbal was tortured and imprisoned by Abbasid official Ahmad ibn Abi Du'ad during the reign of Abbasid caliph Al-Mu'tasim and caliph al-Wathiq. Wikipedia