Emperor Kōkaku
An analysis of silver currency in China and Japan "Sin sen sen pou (Sin tchuan phou)" was presented to the Emperor in 1782 by Kutsuki Masatsuna (1750–1802), also known as Kutsuki Oki-no kami Minamoto-no Masatsuna, hereditary "daimyōs" of Oki and Ōmi with holdings in Tanba and Fukuchiyama. Masatsuna published "Seiyō senpu" ("Notes on Western Coinage") five years later, with plates showing European and colonial currency. Countrywide currency reforms later came after the Meiji Restoration when a new system was adopted around the Japanese yen. In 1786, former Empress Go-Sakuramachi engaged Go-Momozono's only child (Princess Yoshiko) to the new Emperor. Yoshiko formally became Empress consort to Emperor Kōkaku at age 15.