ʿUmar ibn ʿAbdallāh ibn Marwān or ʿAmr ibn ʿUbaydallāh ibn Marwān, surnamed al-Aqtaʾ, and found as Amer or Ambros in Byzantine sources, was the semi-independent Arab emir of Malatya from the 830s until his death in the Battle of Lalakaon on 3... Wikipedia