Kumi-Uchi Jiu-Jitsu originated during the time of the samurai. When samurai lost use of their weapons they would resort to Jiu-Jitsu. Because of the armor they wore, punches and kicks were impractical, and so they resorted to the use of throws, locks and breaks.
When samurai were no longer dominant, Jiu-Jitsu became more popular among the Japanese citizens. Because they did not wear armor, more strikes were incorporated into the art.
Derivatives
Jiu-Jitsu is an ancient art. From Jiu-Jitsu, other arts have been derived.. Some of these are:
-Judo
-Brazilian Jiu-Jitsu (derived from Judo)
-Aikido