أمير المؤمنين
Abu Bakr al-Baghdadi is a "nom de guerre". He had various names and epithets, including Abu Du'a ( '), Al-Shabah (the phantom or ghost), Amir al-Mu'minin, Caliph (sometimes followed by Abu Bakr, al-Baghdadi, or Ibrahim), and Sheikh Baghdadi""'." Other aliases used by al-Badri include Dr. Ibrahim Awad Ibrahim Ali al-Badri al-Samarrai.