Hasan-i Sabbah
…1050 – 12 June 1124), also known as Hasan I of Alamut, was a military leader, founder of the Nizari Ismai'li sect, Order of Assassins, as well as the Nizari Ismaili state, ruling from 1090 to 1124 AD. Alongside his role as a leader, Sabbah was a scholar of mathematics, most notably in geometry, as well as astronomy and…