"previous war" . . "Sasanian supporters ofKhosrow II" . "broke the peace treaty" . "War for the Caucasus" . . "resumed the war" . "572\u2013591" . . . . "Sasanian Empire" . . "Byzantine\u2013Sasanian War" . "preoccupied in the East" . "Byzantine\u2013Sasanian War of 572\u2013591" . . "in 587" . . . . . "a war" . "Byzantine victory" . . . "Sasanian Persian Empire" . . . . "military campaign" . . . . . . "fought the Byzantines" . "Byzantine\u2013Sasanian War of 572\u2013591" . . . "Khosrow IIis restored to the Sasanian throne" . . . . . . "Byzantine-Sasanian peace pact in 591" . "Byzantine Empire" . . "Ghassanids" . . "Roman-Sasanian War of 572-591" . . . "a long, indecisive campaign in 572\u2013591" . . . . . . . . . . "war of 572\u2013591" . . . . . . "Lakhmids" . . . . . . "Byzantine\u2013Sasanian Wars of 572\u2013591" . . "Siege of Philippopolis (589)" . . . . . "against the Persians" . . . "was fighting" . . . . . . "Armenians" . . . "another war with Persia" . "war with Sasanian Persia" . . "War of 572\u2013591" . "Siege of Apathea (573)" . . "pre-591 frontier" .