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Ninpiden

The Ninpiden or Legends of Ninja Secrets is a ninjutsu manual written around 1655 and attributed to either Hattori Kiyonobu or Hattori Hanzo. It is regarded as one of the three key historical texts of ninjutsu, along with the Shōninki and the Bansenshukai. It was passed down in the Hattori family, and was considered a secret transmission; it was not shared with outsiders and even within the family, few had access to it.