Al-Hilli

Jamāl ad-Dīn al-Ḥasan ibn Yūsuf ibn ʿAli ibn al-Muṭahhar al-Ḥillī, commonly known as al-Allāmah al-Ḥillī, was a Twelver Shi'a Muslim scholar and theologian of Iraqi Arab descent. He is widely regarded as one of the most influential Twelver Shi'i scholars of his time. He was a leading Twelver theologian and an influential early mujtahid in Shiʿi jurisprudence. Later sources retrospectively call him "Ayatollah", though the title originated centuries after his death.