The word assassin is widely believed to be originated from the terror group active in a wide area from Iran to Syria and Egypt, led by Hasan-i Sabbah, acting with an ideological motivation derived from İsmailiyya branch of Shi’ism. Hasan-i Sabbah was widely regarded as both the propagandist of its strict sectarian stance, a military and ideological leader of its organisation, and a strategic mastermind behind selection of critical targets and capturing almost unconquerable castles and cities in order to hide its militants.