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In the unrest of the Sengoku period (15th–17th centuries), mercenaries and spies for hire became active in the Iga Province and the adjacent area around the village of Kōga ,  and it is from the area's clans that much of our knowledge of the ninja is drawn. Following the unification of Japan under the Tokugawa shogunate (17th century), the ninja faded into obscurity.  A number of shinobi manuals, often based on Chinese military philosophy , were written in the 17th and 18th centuries, most notably the Bansenshukai (1676).