Among other Shi'as entrusted with administrative posts we may mention the author of "al-Awraq", (Suli) Yahya ibn Salamah Hasfaki and ibn Nadim (the author of "alFihrist"), Abu Ja'far ibn Yusuf and his brother Abu Muhammad Qasim (whose panegyrics and elegies upon the Ahlu 'l-bayt have no parallel: see "al-Awraq") were "mu'tamad 'umumi (general secretaries) during the time of Ma'mun, and even for a considerable time after the latter's death.
Yeye alikuwa ni mtumwa aliyefanywa huru na Umm Hani, binti yake Bwana Abu Talib a.s. (dada yeke na Amir al-Mu'minin Imam Ali a.s.) Dhahabi amemwelezea kwa kusisitiza kuwa huyo ni rafidhi; yeye alikuwa ni mfuasi halisi wa Imam Muhammad al-Baquir a.s., riwaya zitokanazo na yeye zinapatikana katika Sahih al-Tirmidhi.