What is "al-hilli"

Jamāl ad- Dīn Hasan ibn Yusuf ibn 'Ali ibn-i Mûtahhar al-Hilli , also known as al- Allamah al-Hilli (, "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.