The name of the artist was Tsunetaro and entered Edo Myochin workshop in 1857. This workshop was protected by Tokugawa Nariaki, the daimyo of Mito and the father of the last of the Tokugawa Shoguns. Later the artist was granted the use of the character "Yoshi" by Nariaki. He died in 1868. See Iida, Katchumen Mononofu no kaso (Tokenshunju Shimbunsha, Tokyo 1991), pl. 20 and 21 and Chappelear Japanese Armor Makers for The Samurai (Miyoshi Printing Co., Ltd, Tokyo, 1987), p. 140.