Mir-i Buzurg belonged to a Sayyid family, he was the son of a certain Abdallah al-Marashi, who was the eponymous ancestor of the Marashi dynasty.

He studied religion and came into contact with Izz al-Din Sughandi, an influential sufi who was a pupil of Abd al-Razzaq ibn Fazlullah, the founder of the Sarbadars of Khorasan.

[1] Mir-i Buzurg shortly conquered the territories of the Afrasiyab dynasty, and laid foundations to the Marashis.

All of Mazandaran was now united under the rule of Mir-i Buzurg, who wanted to spend the rest of his life in devoting himself to religion.

During the reign of the Safavid Shah Abbas I, who was himself a descendant of Mir-i Buzurg from his mother's side, decorated his tomb with gold.

Nevertheless, even after its fall, the Marashi family continued to play an important role in the politics of the Safavid dynasty,[3] as it had before under Khayr al-Nisa Begum, who the mother of Shah Abbas I, and de facto ruler of the Safavid dynasty from February 1578 to July 1579.