They are descended from Ayatollah Mirza Mohammad Mehdi Khorasani (Persian: آيت الله میرزا محمد مهدی حسينی اصفهانی خراسانی شهید رابع), who traced his lineage to Imam Jafar Sadeq through Shah Nematollah Vali.
Mirza Mehdi was one of the most distinguished clerics of his time, teaching theology, Islamic jurisprudence, philosophical sciences, and mathematics.
Currently, Hojjatoleslam Ahmad Alamolhoda (Sadat Shahidi) is the Friday Prayer leader in Mashhad and is also that city's representative in the Iranian Assembly of Experts.
However, other descendants chose different last names (e.g. Khorasani, Habibollahi, Habib, Alamolhoda, Fayyaz or Majidi).
[1][2] Shahidi is the surname of descendants of the martyr Seyed Amin, known as ASeyed Ahmad Shahidi, a religious cleric born c. 1820 and killed by Qajar government forces for defense of human rights in Bafq city of Yazd province of Iran.