Kanemaki Jisai and Sasaki Kojirō were both a what of respective fields of study?
Kanemaki Jisai: Kanemaki Jisai (鐘巻 自斎 , c.1536 – 1615) was a master of the Chujō-ryū fighting style. Sasaki Kojirō:  – April 13, 1612), often anglicised to Kojirō Sasaki, was a prominent Japanese swordsman widely considered a master of his craft, born in Fukui Prefecture.
master