 The next year a new war erupted, when Licinius named Valerius Valens co-emperor, only for Licinius to suffer a humiliating defeat on the plain of Mardia (also known as Campus Ardiensis) in Thrace.The emperors were reconciled after these two battles and Licinius had his co-emperor Valens killed.Over the next ten years, the two imperial colleagues maintained an uneasy truce.