The practice became established as samurai customs and bushido (the code of the samurai) disseminated throughout Japanese culture during the Kamakura period and is believed to have been practiced from the middle ages until the early modern period.
一般的に、鎌倉時代に武士の習慣と武士道が広まるに従って定着し、中世から近世を通じて行われたと思われている。