He lived during Ghaybat al-Kubra...

He lived during Ghaybat al-Kubra, (major occultation) but the date of his death is not known. Bahr­ul­Ulloom mentions him as the teacher of Jafar b. Qawlawayh who in turn taught Shaikh Mufeed. This makes it abundantly clear that Jafar b. Qawlawayh was not a contemporary of Ali b. Babawayh as claimed by some. Ibn Abi Aqeel is still quoted in Fiqh by research scholars. Ibn Junaid Askafi who died in 381 AH, was also Shaikh Mufeed's tutor.

He authored nearly fifty books, and his opinions as a Jurist are still considered and discussed by the fuqaha. In fact, he and the above mentioned Ibn Abi Aqeel are often referred to as "alqadeemain", "the two old and senior…