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A is an approximately wooden staff, used in some Japanese martial arts. The martial art of wielding the jō is called ''jōjutsu'' or ''jōdō''. Also, ''aiki-jō'' is a set of techniques in aikido which uses the jō to illustrate aikido's principles with a weapon. The jō staff is shorter than the ''bō''. Today, the jō is still used by some Japanese police forces. ==Legendary origin== The techniques for jō were reportedly invented by Musō Gonnosuke Katsuyoshi (夢想 權之助 勝吉, fl. c.1605, date of death unknown) after he was defeated by the famous swordsman, Miyamoto Musashi (宮本 武蔵, 1584–1645). They fought each other in a duel sometime between 1608 and 1611, according to Kenji Tokitsu. The record mentioning this duel, the ''Nitenki'', recounts: :''"When Musashi was in Edo, he met an adept named Musō Gonnosuke, who asked to fight him. Gonnosuke used a wooden sword. Musashi was in the process of making a small Bo; he picked up a piece of firewood. Gonnosuke attacked him without even bowing, but he received a blow from Musashi that made him fall down. He was impressed and left."'' A different text, the ''Kaijo Monogatari'' (dated to 1666) differs considerably from the ''Nitenki'' version. In it, Gonnosuke is a boastful and brash warrior who duels Musashi intending to see how Musashi compares with Musashi's father in swordsmanship. The fight occurs in Akashi, not Edo, and Gonnosuke wields a staff four ''shaku'' in length and reinforced with steel rings. After his defeat, he then went to Mount Homan-zan in Chikuzen (near Fukuoka), where he practiced considerably, changing his preferred weapon to four ''shaku'' and two ''sun'' in length - 1.27 meter as compared to 1.21 meter. This school was called the Shintō Musō-ryū because of Gonnosuke's previous training under Sakurai Osuminokami Yoshikatsu of the Shintō-ryū. The school he founded to transmit his techniques has some old records which claims that Gonnosuke, struck by his defeat, went into solitary meditation until he received divine inspiration in a dream; he then invented techniques to fight against Musashi's two swords using only a stick, and defeated Musashi on their next encounter. Assuming the records are accurate and genuine, this would be the only time Musashi was defeated,〔Hatsumi, Hatsumi and Chambers, Quinton (1971). Stick Fighting. Kodansha International Ltd., p. 9. ISBN 0-87011-475-1〕 as the vast majority of documentation states that Musashi was never defeated. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Jō」の詳細全文を読む スポンサード リンク
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