Grandmaster (martial arts) of "Dan" rankings and Black belt and Red belt in martial arts both derive from Judo where they were adopted by its founder Kanō Jigorō. There are many terms similar or equivalent to 'grandmaster' used by various martial arts traditions. Some of these terms derive from older systems, while others are relatively modern. Japanese martial arts commonly use Sensei (先生) meaning "teacher" or literally translated, "born first" or "one who has gone before". A "Sensei" is a person who has knowledge and is willing to teach that knowledge to another. A "Sensei" assists students in "ken shiki" "the pursuit of
History of martial arts there are also attempts to reconstruct other styles, such as Korean swordsmanship and Persian armed combat called "razmafzar". The Japanese term Koryū refers to "old schools" of martial arts which predate 1868; it does not imply that historical styles are actively reconstructed, just that the school's tradition goes back 150 years or more. A reconstructed martial art necessarily rests on historical records, either combat manuals or pictorial representations. Martial arts reconstruction specifically does not claim an unbroken tradition of some historical martial arts. On the contrary, the premise is that in an unbroken tradition, styles significantly evolve over time. It