It is considered that Koshokun was a military attaché to the Chinese palace who visited the Ryukyu Kingdom as one of the Sakuho Shisetsu (entourage of Chinese diplomats for the creation of peerage) in 1756, and there is a theory that the beginning of karate can be traced to this visit by Koshokun to the Ryukyu Kingdom.
この公相君とは、1756年に訪れた冊封使節の中の侍従武官だったのでないかと見られており、空手の起源をこの公相君の来琉に求める説もある。