![Professor Ansarian: The epithet of Imam Ali (peace be upon him) Professor Ansarian: The epithet of Imam Ali (peace be upon him)](https://erfan.ir/system/assets/imgArticle/2018/04/123058_photo_۲۰۱۸-۰۳-۳۰_۲۲-۴۵-۲۳.jpg)
The epithet of Amīr al-Muʾminīn – the commander of the faithful- is a title which only suits Imam Ali (peace be upon him) and nobody else is qualified enough to have this surname. Even the other infallible Imam (peace be upon them) are not allowed to have this epithet.
source : erfan.ir