copyed and pasted from the dictionary heh
Daitō-ryū aiki-jūjutsu (大東流合気柔術), originally called Daito-ryū jujutsu (大東流柔術), is a Japanese martial art that first became widely known in the early 20th century under the headmastership of Sokaku Takeda (武田 惣角 Takeda Sōkaku). Takeda had extensive training in several martial arts (including Kashima Shinden Jikishinkage-ryu and sumo) and referred to the style he taught as Daito-ryū. Although the ryū's traditions claim to extend back centuries in Japanese history there are no known extant records regarding the ryū before Sokaku Takeda. Whether he is regarded as the restorer or founder of the art, the known history of Daito-ryū begins with Sokaku Takeda. Perhaps the most famous student of Sokaku Takeda was Morihei Ueshiba (植芝 盛平 Ueshiba Morihei), founder of aikido.
Sokaku Takeda's third son, Tokimune Takeda, became the headmaster of the art following the death of Sokaku Takeda in 1943. Tokimune Takeda taught what he called Daito Ryu Aikibudo, an art that included the sword techniques of the Ono-ha Itto-ryu along with the traditional techniques of Daito-ryū aiki-jujutsu. It was also under Tokimune Takeda's headmastership that modern dan rankings were first created and awarded to students. Tokimune Takeda died in 1993 leaving no official successor, but a few of his high ranking students such as Katsuyuki Kondo and Shigemitsu Kato now head their own Daito-ryū aiki-jujutsu organizations.
Aikijujutsu - Information from Reference.com