Abu Al-Qasim Ali Ibn Husain Al-Sharif Al-Murtadha (d. 436 A.H), known as Sayyid Al-Murtadha, was one of the most renowned scholars of his time. After the death of Sheikh Mufid and his brother Sayyid Radhi, Sayyid Murtadha shouldered the governmental responsibilities by leading the Shi‘a society. He was the head of high court of justice who led the Alawites and supervised the hajj pilgrimage.

This article touches upon two subjects: Fiqh (Islamic Jurisprudence) and Usul of Fiqh (Principles of Fiqh). Fiqh - the profound understanding of religious rulings - is the most comprehensive subject in Islamic sciences. Among the five schools of thought, namely, Ja’fari, Hanafi, Hanbali, Shafi’i, and Maliki, this article delves into Shi‘a Ja’fari fiqh, offering a glance into its history, key subjects, and sources.