The Top 5 Deadliest Assassin Organizations in History | History Facts

**When the Mongols Clashed With the World’s Deadliest Assassin Order** In the mid-13th century, the invincible Mongol Empire under **Hulagu Khan** — grandson of Genghis Khan — turned its wrath on the Nizari Ismailis, the secretive Shia sect infamous in the West as the **Order of Assassins** (Hashashin). For nearly two centuries, from their impregnable mountain fortresses like Alamut in northern Persia, the Assassins had terrorized the Islamic world with precise, high-profile killings. Masters of