I would like to know more about Abū Ḥanīfa al-Nuʿmān ibn Muḥammad ibn Manṣūr who was said to be the founder of the Ismaili Fatimid Imams. Is his book Da'im al-Islam based on authentic traditions?
Abu Hanifa Al-Qaadhi Al-Nu'man is different from Abu Hanifa Al-Nu'maan of the Hanafi sect. Al-Qaadhi Al-Nu'man was the scholar of Fatemi government in Egypt that is why he is called by some scholars as Al-Masri. He dies in 363 Hijri while Abu Hanifa Al-Nu'man died in 150 Hijri.
Al-Qadhi Abu Hanifa Al-Nu'man is also known as Ibn Hayyoon ابن حيّون .
He had many books including his most famous book known as Da'aa'im Al-Islam دعائم الإسلام
He was not the founder of Fatemi imams but the scholar who spread the message through his books.
'He started as a Sunni Maliki but through research became an Imami scholar following the Twelve Imams.
'His book Da'aa'im Al-Islam has many authentic narrations from Ahlul Bayt (AS) but also has some matters which are not authentic.
'Wassalam.