Amir al-Mu'minin

Amir al-Mu'minin (Arabic: أَمِيرُ المُؤمِنِين, romanizedʾAmīr al-Muʾminīn), or Commander of the Believers (also translated as Commander of the Faithful), is a politico-religious title in Islamic history denoting supreme leadership over the Muslim community (ummah). The term combines amīr (lit.'commander, leader') with al-muʾminīn (lit.'the believers'), thereby signifying authority that is simultaneously military, administrative, judicial, and moral in nature.