Hasan-i Sabbah

Hasan-i Sabbah (Persian: حسن صباح, romanized: Ḥāsān-e Śaḇaḥ; c. 1050 – 12 June 1124) was a religious and military leader, founder of the Nizari Ismai'li sect widely known as the Hashshashin or the Order of Assassins, as well as the Nizari Ismaili state, ruling from 1090 to 1124 AD.

Hasan-i Sabbah
حسن صباح
Old Man of the Mountain, Hasan-i Sabbah's 19th century engraving
TitleMawla, Sayyidna (Our Master)
Personal
Bornc.1050
Qom, Seljuk Empire
(present-day Qom, Iran)
Died12 June 1124 (aged 7374)
ReligionIsmaili Shia Islam
JurisprudenceNizārī
Da'a'im al-Islam
Main interest(s)
OccupationLeader of Nizārī Ismā'īlī state
Senior posting
PredecessorPosition Established
SuccessorKiya Buzurg-Ummid
Influenced

Alongside his role as a formidable leader, Sabbah was an accomplished scholar of mathematics, most notably in geometry, as well as astronomy and philosophy, especially in epistemology. He came to be known in the West as the Old Man of the Mountain, a name given to him in the writings of Marco Polo that referenced the sect's possession of the commanding mountain fortress of Alamut Castle.

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