Order of Assassins
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The Order of Assassins or simply the Assassins were a Nizari Isma'ili order that existed between 1090 and 1275 AD, founded by Hasan-i Sabbah. Wikipedia
Founder: Hassan-i Sabbah
Founded: 1090
Headquarters: Alamut Castle (Persian Assassins); Masyaf Castle (Levantine Assassins)
Imam: Hasan-i Sabbah (first); Muhammad II (last)
Official language: Arabic, Persian, other languages