The Aikijutsu reference article from the English Wikipedia on 24-Apr-2004
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Aikijutsu

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Aikijutsu, also known as Aikijujutsu, is a form of self-defence. Daito-Ryu Aikijutsu was originally developed during feudal times by the Takeda clan, in support of the Emperor. In modern times, the best-known style of aikijutsu is that developed by Takeda Sokaku from Daito-Ryu. This style was taught primarily to police officers and the military, and was a central influence in Ueshiba Sensei's development of Aikido.