Musō Jikiden Eishin Ryū 

Traces its lineage back to the mid 1500's where Hayashizaki Jinsuke Shigenobu (1546-1621), a retainer of the Mogami clan, is deemed to have invented or repopularised what we now know as Iai.

The original techniques of the school were added to by Shuze Hasegawa Eishin almost two hundred years later. These techniques were primarily concerned with combat from tate-hiza, a posture adopted for sitting when wearing armour.
Omori Rokurozaemon Masamitsu, a swordsman of the Yagyu Shinkage Ryū, was responsible for adding another set of techniques executed from the formal sitting position of seiza. Seiza was becoming a more popular method of sitting indoors during this period, due to the influence of the Ogasawara clan.

Ōe Masamichi (1852-1927) was the last undisputed headmaster of this line. He took the techniques of Omori Ryū and Eishin Ryū and combined it with the Tanimura-Ha to form Musō Jikiden Eishin Ryū. Ōe sensei was notably also the 15th generation headmaster of the Shimomura-Ha before becoming 17th headmaster of the Tanimura-Ha. Ōe sensei was said to have been influenced by his combative experiences in the Hamaguri Gomon no Ikusa (The Clam Gate War). Ōe Masamichi never named a successor to continue the lineage, however several of his students did receive Menkyo Kaiden (certificates of total transmission).

Iwata Norikazu (1913-2011) was the Kaicho of Zenkoku Roshukai until his recent sad death, an organisation created to pass on Musō Jikiden Eishin Ryū as taught by Ōe Masamichi. Iwata sensei studied under several of Ōe Masamichi's direct students, and held Menkyo Kaiden, as well as Hachidan Hanshi status. Iwata Sensei was highly regarded as both a swordsman, calligrapher and historian.