The term 'ninja' or 'shinobi' (忍び) refers to a historical figure in pre-modern Japan, primarily recognized as a spy and infiltrator. While the concept of the ninja has evolved into a popular cultural icon, the reality of their existence is rooted in a complex history that dates back to at least the 12th century.
During the tumultuous Sengoku period, a time marked by civil unrest and power struggles, the jizamurai—peasant-warriors from Iga Province and the neighboring Kōka District—banded together to form ikki, or leagues. These groups emerged as a means of self-defense and quickly gained notoriety for their military prowess, offering their services as mercenaries and spies to various factions.
Despite the romanticized portrayals of ninjas as assassins in modern media, historical evidence suggests that their primary roles were more aligned with espionage and intelligence gathering. Following the establishment of the Tokugawa shogunate in the 17th century, the prominence of the ninja began to wane, leading to their gradual fade into obscurity.