Daito-Ryu Aiki-Jujutsu was originally called Daito-Ryu Jujutsu and is a Japanese Martial Art that became well known in the early 1900s under Takeda Sokaku the Grand Master of Daito-Ryu Aiki-Jujutsu.
Takeda Sokuku studied Aiki-Jujutsu with his grandfather when he was a boy, and at age 16 begin training under Tanoma Saigo, a Daito Ryu Aiki-Jujutsu Master. Takeda is said to have traveled for 20 years from dojo to dojo challenging every known Martial Arts Master, and never was defeated.
Daito-Ryu literally means Great Eastern School and Daito-Ryu Aiki Jujutsu is a form of Jujutsu that puts an emphasis on neutralizing an attack. The focus is the timing of a defensive technique to neutralize an attacker's effectiveness, and to use the force of the attacker's movement against them.
Daito-Ryu utilizes Atemi (the Striking of Vital Points) to set up Jointlocking and Throwing techniques.
Daito-Ryu maintain a direct lineage to a Minamoto clan Samurai named Minamoto no Yoshimitsu who lived about 900 years ago (1045-1127). According to Daito-Ryu's history, Yoshimitsu dissected the corpses of men killed in battle and studied them for the purpose of learning Atemi (Vital Striking Points) and Joint Locking techniques.
Daito takes its name from a mansion that Yoshimitsu lived in when he was a child.
Today Daito-Ryu is the most widely practised form of traditional Jujutsu in Japan.
There have been other Martial Arts that have been influenced heavily by Daito-Ryu Aiki Jujutsu. Morihei Ueshiba who created Aikido, studied Daito-Ryu Jujutsu under Takeda, and Hapkido's founder Choi Yong Sul was trained in Daito-ryu Aiki Jujutsu and blended it with Tae Kwon Do and changed the name to Hapkido.