The   origin of Jujitsu (The Gentle Art) is yet still a mystery, but there  is  no question it is a Japanese art. Many researchers believe that a   Chinese priest (Chen Genpin) introduced the art of Kempo (kicking and   striking) to Japan around 1659. 
Practicing   Jujitsu at Kokushij Temple in Tokyo, Chen Genpin schooled three Samurai named   Fukuno, Isogai and Miura. After completing their training, the three   Samurai independently founded their own Jujitsu Ryu. It was not possible   that Chin Genpin first introduced Jujitsu to Japan. Chinese Kempo,   which he may have brought over to Japan, was of a different art than   Japanese Jujitsu. Jujitsu can also be traced back to before the time   Chin Genpin was in Japan.
An   incident that occurred in Japan in 24 B.C. is evidence that Jujitsu  was  established there. When the Emperor Suinin ordered two men named  Sukune  and Kuehaya to fight his presence, which consisted of kicking,  hitting  and gouging. Sukune won the battle, by trampling on Kuehaya's  back,  breaking his ribs and fatally injuring him. Although this  incident was  know for being the origin of wrestling in Japan, it seemed  to be more  the art of Jujitsu, since Kuehaya was kicked and gouged to  death. 
Sumo   wrestling is the nation sport of Japan, but it is not the only sport   derived from the ancient court wrestling of the Nara Emperors. Wrestling   was banned by edict in 1175 A.D. and hand to hand fighting arts were   started, which were influenced by the military. This lasted for many   centuries and various systems of martial arts were developed. These   systems only concentrated on situations where no weapons were involved,   these systems were called Jujitsu.
It's   impossible to discuss all the different Ryu (styles) of Jujitsu, but   here are a few that are considered to be the most significant of the   art: The oldest Jujitsu movement is the Takenouchi-Ryu, originated by   Takenouchi Hisanori, a native of Sakushu in 1532. This organization   taught Kogusoku (The art of seizing) which was somewhat different than   the pure art of Jujitsu.  Kito-Ryu , originated by Fukuno Schichiroemon   of Temba,  which appeared in the mid seventeenth century. Nage-waza  (The  Art Of Throwing) and Kata (Form Practice) gave the Kito-Ryu great   prestige and popularity. Jukishin-Ryu, originated by Terada Kanemon, a   native of Unsho and the contemporary of Fukuno. Fukuno and Terada lived   in the middle of the seventeenth century and they had a close   relationship. They established two separate systems of Jujitsu, before   the time of Chin Genpin, which were the oldest systems of Jujitsu.