english: Imam al-Hadi (a) was contemporary with seven Abbasid caliphs, al-Ma'mun, al-Mu'tasim, al-Wathiq, al-Mutawakkil, al-Muntasir, al-Musta'in and al-Mu'tazz.[55]
non_english: À í ò ü à ó õ â Ì â â þ è To, on o å ü å û: â and â ð. å û, å ê à, û, é ñ, â â ì, ÿ, â ì, â í, and â ì Ã å Ã ÿ â and õ.