 To a limited extent, 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.