(d. 974 CE) was the preeminent jurist and chief justice of the Fatimid state. Serving under the direction of the fourth Fatimid Imam-Caliph, al-Mu'izz li-Din Allah , Nu’man compiled the Da'a'im al-Islam to provide a definitive legal manual that combined practical law (fiqh) with the spiritual guidance of the Imams.
The role and etiquette of judges, rules of evidence, and criminal punishments. Significance and Availability Legal Authority: Daim Al-islam English Pdf
Often hosts community-uploaded versions of the Fyzee translation. Search for "Daim al-Islam Vol 1 & 2 English" to find digitized copies. Academia.edu: al-Mu'izz li-Din Allah