The is one of three legendary Japanese spears created by the famed swordsmith Masazane Fujiwara, said to be wielded by the daimyō

Daimyo

is a generic term referring to the powerful territorial lords in pre-modern Japan who ruled most of the country from their vast, hereditary land holdings...

 Honda Tadakatsu

Honda Tadakatsu

, also called Honda Heihachirō , was a Japanese general of the late Sengoku through early Edo period, who served Tokugawa Ieyasu. Honda Tadakatsu was one of the Tokugawa Four Heavenly Kings along with Ii Naomasa, Sakakibara Yasumasa and Sakai Tadatsugu. - Biography :A native of Mikawa Province in...

. The spear derives its name from the myth that a dragonfly landed on its blade and was instantly cut in two. Thus Tonbo (Japanese

Japanese language

is a language spoken by over 130 million people in Japan and in Japanese emigrant communities. It is a member of the Japonic language family, which has a number of proposed relationships with other languages, none of which has gained wide acceptance among historical linguists .Japanese is an...

for "dragonfly") and giri (Japanese for "cutting"), translating this spear's name as "Dragonfly Cutter/Cutting spear".