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In page Phocas:

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Despite the executions of the previous emperor and his dynastic successors, Phocas remained in a precarious position, which led him to devote his energy to purging enemies and destroying conspiracies.[citation needed] Because of this focus, and the local resistance he faced all throughout the Eastern Empire, he was unable to confront foreign attacks on the empire's frontiers. The Avars and Slavs launched numerous raids into the Balkan provinces of the Byzantine Empire, and the Sassanian Empire launched an invasion of the eastern provinces of the empire.