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In page Maurice (emperor):

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In ancient sources, Maurice is seen as an able emperor and commander-in-chief, though the description of him by Theophylact may exaggerate these traits. He possessed insight, public spirit, and courage.[citation needed] He proved his expertise on military and foreign affairs during his campaigns against the Persians, Avars and Slavs, and during peace negotiations with Khosrow II. His administrative reforms outlasted his death by centuries and were the basis for the later introduction of themes as military districts.[1]