A Very Brief History of Daito-ryu Aiki Jujutsu
The Daito-ryu scrolls issued by Takeda Sokaku (beginning just before the turn of the century) include a lineage that traces the art back to the Emperor Seiwa, who, legend has it, won his throne when his sumo champion defeated his elder brother's champion. The actual founder of the art is said to have been Seiwa's descendant Shinra Saburo Minamoto no Yoshimitsu [1045-1127], who lived in a mansion known as Daito, hence the name Daito-ryu. The art was then handed down through his descendants, the Takeda family of Kai Province (modern-day Yamanashi Prefecture), until that family's destruction five years after the fall of the its most famous member, general Takeda Shingen, in 1573. A distant relative of Shingen's, Kunitsugu, made his way to Aizu in 1644, where he was taken on as a karo (senior councilor) under the Aizu lord Hoshina Masayuki [1611-1673], son of the second Tokugawa shogun, Hidetada. Daito-ryu tradition asserts that Kunitsugu taught his family's secret techniques to his lord Masayuki, who combined them with the principles of court etiquette that he had learned as oshikiuchi, into a system of self-defense for use within the palace. This amalgamation, together with the Itto-ryu Hoshina later studied, became the basis for the martial arts training of the succeeding lords of the Aizu clan, as well as for its highest ranking members.
The original Takeda family art continued to be passed down in secret within the family itself, eventually to Sokaku's grandfather, Soemon, where the earliest written lineages in Sokaku's mokuroku end. Presumably, however, Soemon then taught Sokichi, who in turn taught his own son, Sokaku.