Umar al-Aqta

ʿUmar ibn ʿAbdallāh ibn Marwān or ʿAmr ibn ʿUbaydallāh ibn Marwān, surnamed al-Aqtaʾ (Arabic: الأقطع, lit. 'the one-handed'; μονοχεράρης, monocherares, in Greek), and found as Amer or Ambros (Ἄμερ or Ἄμβρος) in Byzantine sources, was the semi-independent Arab emir of Malatya (Melitene) from the 830s until his death in the Battle of Lalakaon on 3 September 863. During this time, he was one of the greatest threats to the Byzantine Empire on its eastern frontier, and became a prominent figure in later Arabic and Turkish epic literature.