The Battle of Mauropotamos (Greek: Μάχη τοῦ Μαυροποτάμου) was a battle fought in 844 between the armies of the Byzantine Empire and the Abbasid Caliphate at Mauropotamos river (either in northern Bithynia or in Galatia). The battle followed a period of inconclusive warfare along the Cilician marches and the loss of an entire Arab fleet off Cyprus. The Byzantine regent, Theoktistos, resolved to end the impasse, but the battle resulted in a clear Abbasid victory, due to the desertion of some Byzantine officers. A civil war broke out among the Abbasids soon after however, and they were unable to exploit their victory. A six-year truce was consequently concluded in 845, followed by a prisoner exchange.
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