Kumano Iai Ryo Shrine is the official name of this Shrine. It was built in 807.
Hayashizaki Jinsuke (林崎勘助 - 1542 to 1621)
... is the founder of Iaido and one of the famous sword master during the Sengoku Peirod.
In 1547, his father was killed, and he started training martial arts for his revenge. In 1556, he had a enlightenment of the secret of sword at this Kumano Shrine, and established Iai. In 1561, he succeeded his revenge, and after that, he traveled all over and train many students. His style is called "Muso Hayashizaki Ryu "神夢想林崎流." Legend said, Jinsuke learned Kashima Shintoryu from Tukahara Bokuden, the sword saint. Also, Jinsuke trained samurai of Kato Kiyomasa.
Students of Hayashizaki Jinsuke
Tamiya Shigemasa - the founder of Tamiya Ryu
Sekiguchi Ujimune - the founder of Sekiguchi Ryu
Katayama Yasuhisa - the founder of Katayama Ryu
Also, Jinsuke considered as the founder of Muso Jikiden Eishin Ryu.