Kochu was the 13th master of the main Honami line of sword appraisers.
Traditionally the Inaba family descended from Prince Hikosahima no Mikoto, a member of the 7th Emperor Korei's family, historically from Kono Michitaka in the 14th century. The Inaba family divided into the senior and junior lines in the 16th century, the junior branch held fiefs successively in Echigo, Sagami, Shimosa and finally from 1723 at Yodo in Yamashiro with a revenue of 115,000 koku. The last daimyo Inaba Masakami was appointed Governor of Kyoto in 1868 by the Emperor Meiji and ennobled as Viscount in 1881 when he held the post of President of the Council of Interior Affairs.
A document states that the Masamune blade was presented to Lord Inaba by Tokugawa Ieyoshi (1837-1853), the 12th Shogun 'at the end of and in view of a prosperous year'. There is also a certificate dated 2nd December Showa 26 (1951) signed and sealed by the then head of the family Inaba Masayoshi referring to the koshirae.