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The Battle of Sebastopolis was fought near the eastern shores of the Black Sea in 692 between the Byzantine Empire and Umayyads. The Byzantines were led Justinian II. The Byzantine loss can be attributed to the defection of upwards of 20,000 Slavs due to the harsh treatment under Justinian II, thus ensuring a Byzantine defeat. In the aftermath of the battle the Emperor reportedly rounded up every Slavic family in Bithynia and had them killed.
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