Abu l-Qāsim Jaʿfar b. Ḥasan b. Yaḥyā b. Saʿīd al-Ḥillī (Arabic: ابوالقاسم جعفر بن حسن بن یحیی بن سعید الحلي), (b. 602/1205 - d. 676/1277) commonly regarded as al-Muhaqqiq al-Hillī or al-Muhaqqiq al-Awwal, was a great Shi'a faqih (jurist), usuli, and poet in the 7/13 century. He was one of the best-known faqihs of his time, and he is meant by the word "Muhaqqiq" (researcher) whenever it is used without any indication in the works of faqihs.
|Full Name||Ja'far b. Hasan b. Yahya b. Sa'id al-Hilli|
|Well-Known As||Al-Muhaqqiq al-Hilliو Al-Muhaqqiq al-Awwal|
|Well-Known Relatives||Hasan b. Yahya (father), Al-'Allama al-Hilli, 'Ali b. Yusuf al-Hilli (nephew)|
|Birth||Rabi' II 18, 602/December 2, 1205)|
|Place of Birth||Hillah|
|Death||Rabi' I 13, 676/August 14, 1277|
|Professors||His father, Ibn Nama, Sayyid Fakhkhar al-Musawi, Ibn Idris al-Hilli|