Wars & Conflicts

Muslim Conquest of Persia

Islamic Conquests, Fitna and Jihad

The Rashidun Caliphate's conquest of the Sasanian Empire, beginning with initial raids into Sasanian Iraq in 633 and culminating in the empire's complete collapse by 651. The decisive engagements were the Battle of al-Qadisiyyah in 636, which broke Sasanian power in Iraq and opened the way to the capital Ctesiphon, and the Battle of Nahavand in 642, remembered in Islamic tradition as the Victory of Victories, after which organized Sasanian resistance disintegrated into a prolonged campaign across the Iranian plateau.

Facts

Consequences

What It Settled

The complete end of the nearly four-century-old Sasanian Empire and the incorporation of the Iranian plateau into the caliphate, a conquest historians frequently contrast with the Levant campaign because, unlike Byzantine Syria, no rival imperial power survived in the region to contest the caliphate's new rule, leaving Persia's political future fully bound to the Islamic world from this point forward. 1

Religious Dimension

Ended the Sasanian Empire's status as the region's Zoroastrian state power, and Zoroastrianism's subsequent centuries-long decline across Iran, from the dominant religion of a state to a minority faith, is traced by historians in substantial part to this conquest and its aftermath, though conversion to Islam across Iran was itself a gradual process spanning centuries rather than an immediate consequence of the military campaign; the conquest also brought a significant transfer of Sasanian administrative and courtly practice into the young caliphate's own governance. 1

The Event

When It Happened

633 to 654, from initial raids into Sasanian Iraq to the final collapse of organized resistance across the Iranian plateau after the Battle of Nahavand. 1

Period

from 633 1

The conventional dates historians use for the conquest of Persia, from the first raids into Sasanian Iraq in 633 to the death of the last Sasanian emperor Yazdegerd III in 651 and the completion of the conquest of the eastern Iranian provinces by 654.

Period

to 654 1

Principal Parties

The Rashidun Caliphate under Umar ibn al-Khattab and later Uthman ibn Affan against the Sasanian Empire under its last emperor Yazdegerd III, whose court fled progressively eastward as each successive province fell. 1

Open Questions

Death Toll Assessment

No scholarly estimate of the total dead in the Muslim conquest of Persia exists. The battles of al-Qadisiyyah and Nahavand are closely studied as turning points, but no historian has combined their losses with the conquest's long provincial campaigns into one figure.

Hugh Kennedy's history of the early Arab conquests treats al-Qadisiyyah and Nahavand as the campaign's decisive battles and describes the fall of the Sasanian empire in narrative terms, without a casualty total, and notes that the surviving Arabic accounts of these battles were written generations later.

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Al-Qadisiyyah, Nahavand and the Fall of the Sasanian Empire

This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.

The Muslim Conquest of Persia was the Rashidun Caliphate's conquest of the Sasanian Empire, beginning with initial raids into Sasanian Iraq in 633 and culminating in the empire's own complete collapse by 651. The decisive engagements were the Battle of al-Qadisiyyah in 636, which broke Sasanian power in Iraq outright and opened the way to the imperial capital Ctesiphon itself, and the Battle of Nahavand in 642, remembered in Islamic tradition as the Victory of Victories for what it achieved.

After Nahavand, organized Sasanian resistance disintegrated into a prolonged campaign across the whole Iranian plateau under Caliphs Umar ibn al-Khattab and later Uthman ibn Affan, against the Sasanian Empire's own last emperor Yazdegerd III, whose royal court fled progressively eastward as each successive province fell to the caliphate's advancing forces, ending nearly four centuries of continuous Sasanian rule over Persia and its many peoples. The distance between al-Qadisiyyah in 636 and the campaign's final conclusion in 651 spanned fifteen years, reflecting the sheer size of the Sasanian Empire the caliphate's forces were dismantling province by province rather than in any single decisive campaign season.

The End of a Zoroastrian Empire, and a Conversion That Took Centuries

This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.

The Muslim Conquest of Persia ended the Sasanian Empire's own status as the region's Zoroastrian state power after nearly four centuries of continuous rule. Zoroastrianism's subsequent centuries-long decline across Iran, from the dominant religion of a great state to a minority faith practiced by a shrinking community, is traced by historians in substantial part to this conquest and its long aftermath, though conversion to Islam across Iran was itself a gradual process spanning centuries rather than any immediate consequence of the military campaign alone.

Historians frequently contrast this conquest with the earlier Levant campaign, because, unlike Byzantine Syria, no rival imperial power survived anywhere in the region to contest the caliphate's new rule once Yazdegerd's own court had fled and fallen. That left Persia's political future fully bound to the Islamic world from this point forward. The conquest also brought a significant transfer of Sasanian administrative and courtly practice into the young caliphate's own governance, a legacy that outlasted the religious transformation it had accompanied.

Connections

Associated With

Iraq

This source names Iraq directly: "with initial raids into Sasanian Iraq in 633 and culminating in the empire's complete collapse by 651."