Amir al-Mu'minin
Ibn Khallikan, a 13th-century Muslim scholar, states that 'Qatari' is not his given name, but instead refers to the name of the region where he hailed from. A member of the Banu Tamim tribe, he held the title of Amir al-Mu'minin, which translates to 'leader of the faithful' and was the formal title of the Caliphs. His nicknames were "Na'ama" (ostrich) and "Abu al-Mawt" (father of death). It has been asserted that he was the first Khawarji leader to promote jihadism, as his poems glorified courage, death and war in the name of Allah.