6 centuries of imperial existence, and much cheaper in protecting the Empire during this time with a new and permanent peace – millions of solidi saved by the end of tribute to the Persians . Hand in hand is the only way to land poster. After his victory on the eastern border, Maurice was free to focus on the Balkan region and in 602 after a series of successful campaigns he pushed the Avar and Slav back across the Danube. After Maurice was assassinated by Phocas, the Persian king Khosrau (Maurice’s son-in-law) took advantage of this reason to retake the Roman province of Mesopotamia. Phocas, an unpopular ruler who was always depicted in Byzantine documents as a “tyrant,” was the target of attack by a group of senior members.