The Imāms ‘Alī al-Hādī ("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 ‘Askariyyain "Dwellers in the Camp". They died and were buried in their house on Abī Ahmad Street near the mosque built by Mu‘tasim.[5] A later tradition attributes their deaths to poison.