Without peer, direct transmission style of Eishin
Musō Jikiden Eishin-ryū (MJER) is a koryū, or old style of Iaidō, and traces back to the 16th Century (Sengoku period).
The founder, Hayashizaki Jinsuke Shigenobu, prayed for 100 days at a shine in modern day Yamagata, Japan for help to avenge his fathers death. He was divinely inspired to develop the techniques that would one day become Iaidō.
Another headmaster of this koryū was Hasagawa Eishin. He introduced many innovations to the school. After seeing a skilful demonstration, the Shogun, Toyotomi, referred to him as musō or without peer. This is reflected in the schools name.
The last undisputed head of MJER was Oe Masamichi. At the end of the 19th Century he reorganised the curriculum & his many students spread iaidō throughout Japan, and the rest of the world.