Jamāl ad-Dīn Hasan ibn Yusuf ibn 'Ali ibn-i Mûtahhar al-Hilli (Arabic: جمال الدين الحسن بن يوسف الحلي), also known as al-Allamah al-Hilli (Arabic: العلامة الحلي, "the sage from Hilla"), born December 15, 1250 CE (19 Ramadan 648 AH), died December 18, 1325, was a Twelver Shia theologian and mujtahid. Known as a Marja' (Grand Ayatollah), he was one of the well known Shia scholars of his time. His full name is Jamal al-Din Abu Mansur Hasan ibn Yusuf ibn Mutahhar al-Hilli. We know of at least one hundred books written by him, some of which are still in the form of manuscripts.Muhammad bin Al-Hassan al Hurr Al- Amili in his work Amal al Amil, p. 40, enumerated no less than 67 works of this learned author.
Al-Hilli’s name is as follows: His kunya was Abu Mafsūr and his first title was 'Allāma "sage", his second Jamāl al-dīn and third Jamāl al-Milla wa l-Ḥaqq wa l-Dīn. His given name was Hassan and his father's given name was Yusuf.
Al-Hilli also known as the sage of Hilla, was born in the still existent town of Al Hillah (in what is now Iraq), commonly viewed as the centre of Shia Islam when Sunni leaders were in control over Baghdad during his life. He entered into a prominent family of Shia jurists and theologians. His father, Sadid ul-Din al-Hilli, was a respected mujtahid and a leading figure in the Shia community. His maternal uncle Muhaqqiq al-Hilli was also a renowned scholar.