Ogasawara Nagahide

was a Japanese nobleman and military commander during the Muromachi period (1336 – 1573).

Sangi ittō ōsōji

Nagahide, a scion of the Ogasawara clan, was responsible for codifying the teachings of the Ogasawara-ryū into an anthology titled , " The Three Unified Teachings ". In this work, commissioned by the shōgun Ashikaga Yoshimitsu, he collated his family's practices of horsemanship, archery and etiquette, basing his knowledge on the teachings of his great-grandfather, Ogasawara Sadamune (1294 – 1350). Apart from his role in the compilation of the Sangi ittō ōsōji, Ogasawara was himself an expert at both bajutsu horsemanship and archery. He entered Shinano in October 1400 and attempted to assume the role of shugo. The battle was first fought at Shinomiyakawara in present-day Nagano City, but after a loss there Nagahide fled with the remnants of his force of less than 800 horsemen to Shiozaki Castle. Nagahide soon lost Shiozaki Castle and fled to Ōtō Castle, where he suffered a final crushing defeat on October 17, 1400.

Retreat to Kyoto and death

Ōi Mitsunori of the Ōi clan negotiated Nagahide's release from Ōtō Castle, and a despondent Nagahide returned to Kyoto. Ogasawara was dismissed as the shugo governor of Shinano Province, and the control of Shinano Province reverted to local warlords.