Hand in hand with Shinkage Ryu, the Yagyu later absorbed an art of Iai as well which is taught in tandem at the Yagyukai. The first part of this article is taken from the Yagyukai site which is an informative reference and can be found here . The second part in italics is quoted from the kampaibudokai site. Yagyu Seigo Ryu Batto-jutsu Isahaya Chouzaemon Nobumasa learned the techniques of ju-jutsu and batto (sword drawing) from the monk Seigo, and created a school which he called Seigo Ryu. Isahaya's leading disciple, Kajiwara Genzaemon Naokage, passed Seigo Ryu down to the warriors of the Owari domain, and Nagaoka Fusahide, who played an active role as an assistant to the headmasters of Yagyu Shinkage Ryu Heihou, mastered the heart of Seigo Ryu Batto. In the following generation, Nagaoka Fusashige, another important figure in the history of Owari Yagyu Shinkage Ryu, continued to develop its theory and technique in accordanc...