Al-Qadi an-Nu'man القاضي النعمان or Abu Hanifa al-Nu‘man ibn Muhammad ibn Mansur ibn Ahmad ibn Hayyun al-Tamimi (died 974 CE/ 363 AH) the Isma'ili jurist and official historian of the Fatimid dynasty. Had certainly written a lot of books and papers to defend the Fatmid dynasty and the Isma'ili and in general Shi'a jurisprudence and belief.
Arabic Wikipedia says he first was a follower of the Maliki school of fiqh. His name certainly may create confusion with that of abu Hanifa the known Sunni scholar and "founder" of the hanafi maddhab.
I wonder if he compiled a book entitled (or maybe referred to as) "Al-Fiqh al-Akbar" - a book with the same title is known to have been compiled by abu Hanifa-, if so what is the topic of this book?
Also what books did he write about Creed and Aqeedah?