is jidaigeki novel written by Shà Âtarà  Ikenami. The novel deals with the Sanada clan during the Warring States period in Japan The stories were originally serialized as a serial in the Japanese magazine Shà «kan Asahi between 1974 and 1982. The novel was adapted into a television series in 1985 and a manga series.
Shà Âtarà  Ikenami Sanada Taiheiki Museum was opened in Ueda, Nagano in 1998.