Tomokuyu was a system that had long existed from the ancient China, and in the Han dysnasty, the lands were given to the members of the Imperial family, excluding the lords and kings, for their own income sources.
湯沐邑は、中国に古くからあった制度で、漢代には個人の収入源として諸侯や王以外の皇族に与えられる領地であった。