Although Yoshichika TSUBOI of Kawachi Province was an ordinary citizen, he was considered top of the field of research into official posts and costume, and it is said even kuge sat at his feet.
河内国の壺井義知は民間の出ながら、官職・装束の研究においては当代随一とされて、公家さえもが教えを乞うたと言われている。