Muhammad ibn Musa al-Khwarizmi (c. 780 - 850 A.D.) daniel-hromada ()

Muhammad ibn Musa al-Khwarizmi (c. 780 - 850 A.D.)

persian scholar from golden-age of islamic science
his name Latinized as "Algorithmi" (Port. "guarismo" and Spanish "algarismo" mean digit)
since 820 A.D. the astronomer and head of the House of Wisdom in Baghdad
contributions to Algebra, Arithmetic, Astronomy, Trigonometry, Geography