What early Muslim Order killed sultans, kings, advisors, and the like?

When Marco Polo learned about the guerilla cult of Muslim assassins, he interpreted the name of the group as relating to hashish (marijuana), so he called them the "Hashishin". This name stuck. Forming as a result of the First Crusade, the splinter order of Shi'a Muslims practiced self-sacrifice in order to kill their targets, with its imam founder, Hassan-i Sabbah, remarking, "the killing of this devil is the beginning of bliss."

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