Ayatullah al-Uzma Sayyid Abul Hasan Isfahani
He was born in 1277 AH. in one of the villages on the outskirts of Isfahan. He was a Faqih of the first rank, and a sole Marja after the death of his contemporary, Mirza Husain Naeeni. The tenure of his Marjaiyyah is particularly known for its commendable administration. After his preliminary training in Isfahan he traveled to Najaf and gradually joined the lessons of Akhund Khurasani, who soon recognized the talents of his disciple.
His famous Amaliyya in Fiqh is 'Waseelat un-Najat' which due to its comprehensive nature, has been elucidated by many Fuqaha including Ayatullah Khomeini. Among his famous students were Ayatullah Seyyid Muhsin al-Hakim, Ayatullah Seyyid Meelani, Ayatullah Mirza Hashim Amuli and others. He died in Najaf on 9th Dhul Hijjah in 1365 AH.