Al-Askari mosque
The Imāms `Alī l-Hādī (also known as an-Naqī) and Hassan al-`Askarī lived under house arrest in the part of Samarra that had been Caliph al-Mu'tasim's military camp (`Askaru l-Mu'tasim). As a result, they are known as the `Askariyyān ("Dwellers in the Camp"). They died and were buried in their house on Abī Ahmad Street near the mosque built by Mu'tasim. A later tradition attributes their deaths to poison.