Ittō-ryū was founded by Itō Ittōsai Kagehisa (pictured right) at the end of the Warring States Period of Japan in the late 16th century. The Ono 'branch' was established by Itō Ittōsai's successor, Ono Jiroemon Tadaaki.
Ono-ha Ittō-ryū developed as a comprehensive study of kenjutsu (Japanese swordsmanship) and would later become one of the official schools of the Shogunate (military government) along with Yagyū Shinkage-ryū 柳生新陰流.
The school would pass through the Ono family until it transferred to the Tsugaru, then to Sasamori Junzō in the 20th century.
Over the centuries, Ono-ha Ittō-ryū would develop a system of over 170 waza (techniques) for ōdachi (long sword) and kodachi (short sword) forms to transmit its principles of kenjutsu.
大太刀 Ōdachi
小太刀 Kodachi
合小太刀 Aikodachi
三重 Sanjū
刃引 Habiki
払捨刀 Hoshatō
五点 Goten
ハキリ合 Hakiriai
個之太刀 Kuka-no-Tachi
他流勝之太刀 Taryūgachi-no-Tachi
詰座抜刀 Tsumeza Battō
立合抜刀 Tachiai Battō
清め之太刀 Kiyome-no-Tachi
軍神未配之式太刀 Gunshin Mihai-no-Shiki Tachi
In addition to its prominence as a sword school, Ono-ha Ittō-ryū would have a substantial influence in the formation of many schools of budō (martial arts), including Daitō-ryū Aikijūjutsu, Kendō and Aikidō.
Daitō-ryū
Kendō
Aikidō