Historical Organization
Abbasid Caliphate
Abbasid Caliphate
Details
Organization Timeline
Al-Mansur founds Baghdad
📅 30 July 762The new Abbasid capital was founded on 30 July 762 and became a major center for scholarship, administration and translation.
Astronomers help choose Baghdad's foundation date
📅 30 July 762Naubakht and Masha'allah reportedly selected an astrologically auspicious moment, illustrating the close relationship between mathematical astronomy and state planning.
Baghdad connects Persian, Indian and Greek knowledge
📅 30 July 762The city's multilingual scholarly environment later supported translations and original work in arithmetic, algebra, geometry and astronomy.
The Round City's design expresses applied geometry
📅 30 July 762Baghdad's planned circular form joined surveying, geometry, architecture and imperial symbolism in a major urban project.
Astronomers select Baghdad's foundation date
📅 30 July 762Naubakht and Masha'allah calculated an auspicious horoscope for construction of the Abbasid capital on 30 July 762.
Baghdad's founding joins astronomy and statecraft
📅 30 July 762Celestial calculation helped legitimize an imperial city and demonstrates the close historical relationship between astronomy and astrology.
Persian and Jewish scholars shape the new capital
📅 30 July 762The planners' backgrounds reflect the multilingual and multireligious networks that later supported scholarship in Baghdad.
Baghdad becomes a center of astronomical translation
📅 30 July 762The city developed institutions where Indian, Persian and Greek materials were translated, criticized and extended in Arabic.
Baghdad surrenders to the Mongol army
📅 10 February 1258The Abbasid caliph surrendered on 10 February 1258, followed by the sack of a city central to centuries of scientific exchange.
Scholarly collections are dispersed or destroyed
📅 10 February 1258Libraries and institutions suffered catastrophic loss, although the familiar story that all books were thrown into the Tigris cannot be treated as a precise inventory.
Mathematical scholarship continues beyond Baghdad
📅 10 February 1258Knowledge survived through manuscripts and scholars in Maragha, Damascus, Cairo, Central Asia and other centers, preventing a simple rise-and-collapse narrative.
The conquest changes networks of patronage
📅 10 February 1258The destruction of Abbasid institutions redirected scholars and resources, reshaping rather than ending mathematics in the Islamic world.
Baghdad surrenders to the Mongol army
📅 10 February 1258The conquest devastated a city central to centuries of astronomical, mathematical and medical scholarship.
Scientific networks survive beyond one city
📅 10 February 1258Manuscripts and scholars continued work in Maragha, Damascus, Cairo, Central Asia and other centers.
Patronage shifts after the Abbasid collapse
📅 10 February 1258The conquest redirected resources and personnel, contributing to new observatory projects under Mongol rule.
The event resists a simple end-of-science narrative
📅 10 February 1258Destruction was severe, but Islamic astronomy continued to innovate; institutional change should not be confused with intellectual disappearance.