sentences:  Maurice and al-Mundhir blamed each other for these difficulties, and their mutual recriminations led to al-Mundhir's arrest in the following year on suspicion of treachery, triggering war between Byzantines and Ghassanids and marking the beginning of the end of the Ghassanid kingdom.In 582, after a victory at Constantina over Adarmahan and Tamkhosrau in which the latter was killed, Maurice was acclaimed emperor following the death of Tiberius II Constantine (r. 574–582).The advantage gained at Constantina was lost later in the year when his successor as "magister militum" of the East, John Mystacon, was defeated on the river Nymphios by Kardarigan.