sentences:  Alarmed by his advance, in 590 members of the Persian court overthrew and killed Hormizd, raising his son to the throne as Khosrow II (r. 590–628).Bahram pressed on with his revolt regardless and the defeated Khosrow was soon forced to flee for safety to Byzantine territory, while Bahram took the throne as Bahram VI, marking the first interruption of the Sassanid dynasty's rule since their empire's foundation.With support from Maurice, Khosrow set out to regain the throne, winning the support of the main Persian army at Nisibis and returning Martyropolis to his Byzantine allies.