Al-Khwārizmī — Encyclopaedia Britannica

Britannica biography of al-Khwārizmī; it gives his birth about 780 and death about 850, his work at the Dār al-Ḥikma under al-Maʾmūn, the Algebra (Kitāb al-jabr waʾl-muqābala), the Hindu-numerals treatise preserved as Algoritmi de numero Indorum, the Ṣūrat al-arḍ geography with the world map and the Sinjār meridian measurement, and the Zīj tables.