I learned recently from Primo Luciano that there was an older art by the name of Judo: jikishin-ryu judo. I think there was another one also. If I understand correctly, these were really jujitsu arts that sought to distinguish themselves from other jujitsu arts--does anyone know if this is correct?
This page claims that the jikishin-ryu system is a root art of judo:
Evidently the existence of other judo systems is the reason for emphasizing that Jigaro Kano's art is Kodokan Judo. There is also Kosen Judo.
This page claims that the jikishin-ryu system is a root art of judo:
Jikishin Ryu. My teacher said that the Kodokan was still reeling from the Fusen Ryu loss [in competition] when he arrived, and later the Jikishin people were courted and eventually won over as part of the effort to "fill out" the syllabus so that the weakness that caused the Fusen loss would never be repeated.
Evidently the existence of other judo systems is the reason for emphasizing that Jigaro Kano's art is Kodokan Judo. There is also Kosen Judo.