The Tenshin Shōden Katori Shintō-ryū included Iaijutsu in its curriculum in the 15th century. The first schools dedicated exclusively to sword drawing appeared some time during the late 16th or early 17th century.
Hayashizaki Jinsuke Minamoto no Shigenobu (1546–1621) is generally credited with as being the originator of the first dedicated school of sword drawing. Little is known of his life – leading some scholars to doubt his historical existence as a real person. The two largest schools of sword drawing that are practiced today are the Musō Shinden-ryū and Musō Jikiden Eishin-ryū. Both schools trace their lineage to Hayashizaki Jinsuke Shigenobu.
Before Nakayama Hakudo (1873?-1958) coined the word Iaido, early in the 20th century, various other names such as Battō, Battōjutsu, or Saya no uchi were used. Iaido is the usual term to refer to the modern self improvement oriented form taught by the All Japan Kendo Federation (AJKF), while Iaijutsu is used for some amongst the older Koryū, combative, techniques.
Seitei Iaido – Respect shown to the sword (tōrei) before and after practice.
Seitei Iaido is the Iaido style of the All Japan Kendo Federation (AJKF, Zen Nippon Kendo Renmei or ZNKR). The twelve Seitei Iaido forms Seitei-gata are now standardised for the tuition, promotion and propagation of Iaido within the Kendo federations. Although not all dojo teach Seitei Iaido, the AJKF uses them as a standard for their exams and shiai.. As a result, Seitei Iaido has become the most widely recognised form of Iaido in Japan and the rest of the world.