Nagano Narimasa (長野業正, 1491–1561) was a Japanese samurai retainer of the Uesugi clan during the Sengoku period and lord of Gunma.
[1][2] He employed the famous spearman Kamiizumi Nobutsuna, who founded the Shinkage-ryū swordsmanship school.
Nagano Zaemon went on to found a style of Koppojutsu and Sojutsu called Gyoshin Ryu.
The Densho called Shinken Shobu Mokuroku, which was originally written in 1603, was destroyed in World War II and was rewritten by a distant relative named Nagano Shigazato in 1981.
Today it is rumored that a distant branch called Nagano Ryu Heihou is the keeper of the revised densho and was founded with its core teachings coming from the Shiken Shobu Mokuroku but this is a rumor and has not been proven.