A title of nobility in Islamic societies, originally meaning 'commander' or 'prince.' Emirs could be military leaders, provincial governors, or independent rulers of smaller Islamic states.
From Arabic 'amīr,' meaning 'commander' or 'prince,' derived from the root 'ʾ-m-r' (to command or order). The full title 'amīr al-muʾminīn' means 'commander of the faithful' and was used by caliphs.
The word 'admiral' comes from 'emir'! European Christians encountered the Arabic title 'amīr al-baḥr' (commander of the sea) during the Crusades and borrowed it as 'admiral.' It's a perfect example of how medieval cultural exchange worked - even enemies learned from each other.
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