Assassins were knights who were skilled in disguise and killing professionally - an image with artificial intelligence. The group was holed up in castles and used assassination as a means to eliminate its opponents.
It caused terror to the Fatimids in Cairo, the Abbasids in Baghdad, and the Seljuks in Iran, in addition to the Crusaders. Its presence in Persia was eliminated by the Mongol leader Hulagu in 1255 AD. In the Levant, Al-Zahir ended it with Peres.