The major threat to the Byzantine Empire in the eleventh century came from the

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The major threat to the Byzantine Empire in the eleventh century came from the Seljuk Turks, a powerful Turkish tribe that migrated to the region that is now Iran and spread throughout the Islamic world. They eventually conquered much of the Byzantine Empire's Anatolian territory and threatened Constantinople itself. The other options either do not apply to the eleventh century or are not historically accurate.

The Major Threat to the Byzantine Empire in the Eleventh