Bujinkan Bujo Taijutsu is a Japanese Martial Art steeped in history with a lineage dating back millenia.
Below is a list of the systems studied under the banner of Bujinkan Budo Taijutsu.
Togakure Ryu Ninjutsu
Gyokko Ryu Kosshijutsu
Kukishinden Ryu Happu Bikenjutsu
Shindenfudo Ryu Dakentaijutsu
Gyokushin Ryu Ninjutsu
Koto Ryu KoppoJutsu
Takagiyoshin Ryu Jutaijutsu
Gikan Ryu Koppojutsu
Kumogakure Ryu Ninjutsu
There are many sites which will provide you with historical information on Bujinkan Budo Taijutsu.
My recommendation is that anybody wishing to research this topic purchase Soke's books which
are available on www.amazon.com or www.buyubooks.com etc.