Wikipedia
Gyokko-ryū
Gyokko-ryū is a school of Japanese martial arts that specialises in kosshijutsu , shitōjutsu and ninpō . Gyokko-ryū was founded by Tozawa Hakuunsai Hogen (戸沢白雲斎, 1156-1159) in the Heian period (794–1192). The sōke title was claimed to be passed down to Masaaki Hatsumi (1931-) from Toshitsugu Takamatsu (1889-1972).