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August 26, 1071 CEPrimary source · 2 sourcesWell documented

Manzikert Shatters Byzantine Anatolia

The Seljuk Turks capture the emperor himself and open Asia Minor to permanent settlement

On the timeline · around August 26, 1071 CE · Crisis, Crusaders, and ExileThe Macedonian Golden AgeCrisis, Crusaders, and ExileManzikert Shatters Byzantine Anatolia100010251050110011251150

Quick facts

Byzantine emperor
Romanos IV Diogenes (captured)
Seljuk sultan
Alp Arslan
Date
August 26, 1071 CE
Consequence
Loss of Anatolia to Turkish settlement

What happened

Emperor Romanos IV Diogenes, who took the throne in 1068 CE determined to reform the Byzantine military against the rising Seljuk threat, marched into Armenia in 1071 CE hoping to catch the Seljuk sultan Alp Arslan off guard despite a peace treaty the two had signed in 1069 CE. The armies met near Manzikert on August 26, 1071 CE, and the Seljuks won decisively, capturing Romanos himself. With the empire thrown into disarray as rival generals fought over the succession rather than defending the frontier, Seljuk forces and Turkish settlers swept across Anatolia largely unopposed in the years that followed.

Why it matters

Manzikert cost Byzantium relatively few casualties directly, but the psychological shock of an emperor's capture and the political chaos that followed opened Anatolia, the empire's most valuable recruiting ground and tax base, to permanent Turkish settlement, a loss from which the empire never fully recovered.

How we know

The World History Encyclopedia's article on the Battle of Manzikert names the opposing commanders, the date, and the long-term consequences, describing the defeat as the watershed after which Byzantine decline became permanent.

Sources

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Part of a timelineThe Byzantine Empire27 events · How the eastern half of Rome outlived the west by a thousand years, then fell to Ottoman cannonView all →