Yamada Asaemon
山田浅右衛門
Hereditary Name of the Yamada Family, Sword-Testers to the Edo Shogunate and Compilers of the Appraisal Text Kaihō Kenjaku
Description
The Hereditary Otameshi Goyō
Yamada Asaemon was the hereditary name borne by successive heads of the Yamada family, who served the Edo shogunate as official sword-testers in the role known as otameshi goyō (御様御用). Under the reign of the eighth shogun Tokugawa Yoshimune, the role passed from the first Yamada Asaemon, Sadatake, to the second, Yoshitoki, after which the Yamada family effectively monopolized the office.
A Peculiar Form of Succession
Although the position was nominally hereditary, only twice did an incumbent pass the role to his own biological son. In most generations, the most skilled disciple was instead adopted into the family and chosen as successor.
Known as "Kubikiri Asaemon"
Because the Yamada family's duties extended beyond sword-testing to include the beheading of condemned criminals, successive heads were popularly known by the nicknames "Kubikiri Asaemon" (Asaemon the Beheader) or "Hitokiri Asaemon."
Compiling the Kaihō Kenjaku
In 1797, the fifth-generation Yamada Asaemon, working with the swordsmanship instructor Sudō Gotayū, compiled the Kaihō Kenjaku, an appraisal text that ranked swords by their cutting performance as demonstrated in actual test-cuts. The wazamono (excellent-cutter) rankings it established were grounded directly in hands-on experience of cutting through bodies and straw targets.
The Wazamono Ranking Tiers
The rankings set out in the Kaihō Kenjaku divided blades by cutting performance into four tiers, from best to lowest: saijō ō-wazamono (best of the best), ō-wazamono, ryō-wazamono, and wazamono — a classification that could only have been drawn from the Yamada family's own hands-on experience of test-cutting bodies and straw targets.
Influence on Sword Appraisal
The Yamada family's rankings, based on this unique perspective of real-world cutting performance, were frequently referenced in later sword appraisal and valuation, and are still cited today as one of the historical benchmarks for judging a Japanese sword's practical cutting ability.
Later Reputation
Far from being remembered merely as executioners, the successive holders of the Yamada Asaemon name left an important mark on the history of the Japanese sword as a lineage of appraisers who judged a blade's worth through the uncompromising evidence of the cutting edge itself.