Aikido Toho Iaido, sometimes referred as Nishio-ryu Iaido, is a style created by Shoji Nishio, a prolific Aikido practitioner.
In 1955, due to the lack of explanation regarding sword and jo techniques from Ueshiba (and other instructors),[1] Nishio started study Iaido under Shigenori Sano (10th dan Muso Jikiden Eishin-ryu).
[2] He achieved 7th Dan Nihon Zenkoku Iaido Renmei.
[3] In iaido, Nishio practiced number of different styles and consolidated what he believed to be useful.
[4] By 2001, after 46 years of learning and perfecting the art, after numerous addition and revision, he finalized his iaido system to 15 katas, most of which correlated to specific Aikido movements.