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In page Baghdad:

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Within a generation of its founding, Baghdad became a hub of learning and commerce. The city flourished into an unrivaled intellectual center of science, medicine, philosophy, and education, especially with the Abbasid translation movement began under the second caliph Al-Mansur and thrived under the seventh caliph Al-Ma'mun.[1] Baytul-Hikmah or the "House of Wisdom" was among the most well known academies,[2] and had the largest selection of books in the world by the middle of the 9th century.[citation needed] Notable scholars based in Baghdad during this time include translator Hunayn ibn Ishaq, mathematician al-Khwarizmi, and philosopher Al-Kindi.[2]