Kanemaki Jisai and Sasaki Kojirō were both a what of respective fields of study?
Sasaki Kojirō Sasaki Kojirō (佐々木 小次郎 , also known as Sasaki Ganryū) (1585? – April 13, 1612), often anglicised to Kojirō Sasaki, was a prominent Japanese swordsman widely considered a master of his craft, born in Fukui Prefecture. He lived during the "Sengoku" and early "Edo" periods and is most remembered for his death while battling Miyamoto Musashi in 1612.
Shinkage-ryū Shinkage-ryū (新陰流 ) meaning "new shadow school", is a traditional school ("koryū") of Japanese martial arts, founded by Kamiizumi Ise-no-Kami Nobutsuna (上泉 伊勢守 信綱, 1508–1578) in the mid-sixteenth century. Shinkage-ryū is primarily a school of swordsmanship ("kenjutsu" and "iaijutsu"), and is a synthesis of Nobutsuna's studies in the school of Kage-ryū (Aizu). Shinkage-ryu can also refer to Kashima derived schools such as Kashima Shinden Jikishinkage Ryu and Kashima Shin Ryu.