Word History: The history of the word assassin shows how legends can influence the development of words as powerfully as facts. European legends about a murderous, drug-crazed sect called the Assassins grew up around the Nizaris, a group of Ismaili Shi'ite Muslims that held strongholds in Iran and Syria from the 11th to the 13th century. The Nizaris opposed the rule of the Seljuk dynasty and the Abbasid caliphs, who were Sunni and regarded the Nizaris as unorthodox outcasts. Sunni accounts of the Nizaris accused them of all sorts of irreligious practices, and one term of abuse applied to the Nizaris was the Arabic word ḥaššāšīn, meaning "hashish users." Reliable sources, however, offer no evidence of hashish use by Nizaris. The Nizaris mounted resistance to this persecution, and one of their most formidable weapons against the Seljuks was the threat of sudden execution by secret agents. Attacks on several leaders among the Crusaders were also attributed to Nizari agents. When the Crusaders returned to Europe, they embellished upon what they had heard about the Nizaris from the group's enemies and told sensational stories about the ḥaššāšīn or Assassins. Marco Polo spun a tale of how young Assassins were given a potion and made to yearn for paradise—their reward for dying in action—by being given a life of sensual pleasure before their secret missions. As the legends spread, the word ḥaššāšīn passed through Italian and French and appeared in English as assassin in the 1500s, already with meanings like "treacherous killer."