Abu Ja'far Muḥammad ibn Mūsā al-Khwārizmī was the name of a Persian mathematician from Baghdad, whose works introduced sophisticated mathematics to the West.
In the 9th century, he wrote a book entitled "The compendium on calculation by restoring and balancing" (الكتاب المختصر في حساب الجبر والمقابلة, al-Kitāb al-Mukhtaṣar fī Ḥisāb al-Jabr wal-Muqābalah), from which also the term "algebra" is derived. "Al jabr" (الجبر) translates to "reunion of broken parts", referring to the novel method of reducing fractions to integers.