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In the early seventh century, Arabia faced intense tribal conflicts and religious persecution against Muhammad's growing Muslim community in Mecca. Facing threats from the Quraysh tribe, Muhammad and his followers undertook the Hijra migration to Medina earlier in 622. Medieval Muslim astronomers later established the Islamic calendar's epoch by projecting their tabular lunar system backward, fixing the start of year 1 AH on the first day of Muharram. This corresponded to July 16 in the Julian calendar, marking the formal beginning of the Hijri era rather than the migration date itself. The choice provided a stable, consensus-based starting point for dating events in the emerging Islamic community. The calendar quickly became central to Islamic religious, legal, and administrative life across expanding territories.

Why it matters: The epoch created a unified dating system still used by over a billion Muslims worldwide for religious observances and civil purposes in several nations. It anchored the Islamic lunar calendar, influencing governance, festivals, and historical record-keeping for centuries. This framework supported the rapid expansion of Islamic civilization from Arabia into Africa, Europe, and Asia.

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762

Other 8th Century Middle East & North Africahigh

Al-Mansur Founds Baghdad as Abbasid Capital

In the mid-eighth century, the Abbasid Caliphate sought a new seat of power after overthrowing the Umayyads. Caliph al-Mansur selected a strategic site along the Tigris River in central Mesopotamia for its defensibility, water access, and trade potential. On July 30, 762, construction began on the circular planned city officially named Madinat al-Salam, or City of Peace. Engineers and laborers erected massive walls, a central palace complex, and a grand mosque under the guidance of Persian administrators known as the Barmakids. The project rapidly transformed the location into a bustling metropolis that attracted scholars, merchants, and artisans from across the Islamic world and beyond.

Why it matters: Baghdad quickly emerged as the political and intellectual heart of the Abbasid Caliphate, fostering the Islamic Golden Age through institutions like the House of Wisdom. Its founding established a model for planned imperial cities that influenced urban development for centuries and positioned the region as a global crossroads of knowledge and commerce until the Mongol invasion in 1258.

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Other Timeline

Islamic Calendar Epoch Begins

Al-Mansur Founds Baghdad as Abbasid Capital