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== The Persian-Byzantine War ====
[[File:Maurice Three.jpg|200px|thumb|left|Modern portrait of Emperor Phocas based on his portrait on coins]]
Maurice's death was to change the dynamic of Persian-Byzantine relations, Maurice had adopted Khosrau II, and his deposition meant that he could legitimately wage a war of revenge against Phocas. The new Byzantine Emperor was incompetent and brutal, and the elite despised him. The Persians invaded the eastern provinces of the Empire, relatively unopposed.
This signaled the start of a 26-year war between the Empires. The Byzantine army was demoralized and leaderless, and they were soon defeated. Phocas rule was tyrannical, and law and order collapsed in many areas. The troops of Khosrau II occupied Syria, Palestine, Armenia and entered Egypt by 608 AD. Phocas was eventually deposed by Heraculus, who was to save the Empire ultimately. He defeated a siege of Byzantium and later launched a counter-attack that led to Khosrau II's defeat and the recapture of all the lost Byzantine provinces. However, the Orthodox Christian Empire was severely weakened and was only a shadow of what it had been in 600 AD, and this was important repercussions for the future of Europe and the Middle East. If Maurice had lived and passed the throne to one of his sons, the mutually ruinous conflict between Byzantine and Sassanian could have been avoided.
====The Arab Invasions====