حسن الصباح
Hassan-i Sabbah was born into a Twelver family living in the scholarly Persian city of Qom in 1056 CE. His family later relocated to the city of Tehran, which was an area with an extremely active Ismāʿīlī Daʿwah. He immersed himself in Ismāʿīlī thought; however, he did not choose to convert until he was overcome with an almost fatal illness and feared dying without knowing the Imām of his time.