Emperor Kōkaku
, adopted son of Mototeru, was a "kugyō" or Japanese court noble of the Edo period (1603–1868). He held a regent position kampaku from 1787-1791. Masahiro was his son who he had with a daughter of the eighth head of Chōshū Domain Mori Shigetaka. Additionally, he was a grandson of Emperor Higashiyama and thus a paternal uncle of Emperor Kōkaku.