Hassan-i Sabbah was a Persian Nizari Ismaili leader who founded the Hashshashin, a secretive group known for their strategic use of assassination during the late 11th century. He established the fortress of Alamut in present-day Iran, which became the center of his operations and a symbol of his power. Sabbah's followers, often referred to as "Assassins," were known for their loyalty and dedication, carrying out targeted killings against political and religious adversaries. His influence extended beyond his lifetime, shaping the political landscape of the region and leaving a lasting legacy in both history and popular culture.