Amir al-Mu'minin
During the Second Fitna, a renowned Khariji commander named Qatari ibn al-Fuja'a, who was described as the most popular, admired and powerful Khariji leader, led the Azariqa, a sub-sect of the Khawarij, in to numerous battles. He held the title of Amir al-Mu'minin and ruled over the radical Azariqa movement for more than 10 years. Born in Al Khuwayr in Qatar, he also minted the first known Kharjite coins, the earliest of which dated to 688 or 689.