Kutsuki Masatsuna (朽木 昌綱, March 5, 1750 – May 18, 1802), also known as Kutsuki Oki-no kami Minamoto-no Masatsuna, was a hereditary Japanese daimyō of Oki and Ōmi with holdings in Tanba and Fukuchiyama.[1] His warrior clan was amongst the hereditary vassals of the Tokugawa family (the fudai) in the Edo period. His childhood name was Tomojiro (斧次郎).
Masatsuna was a polymath and a keen student of whatever information was available at that time concerning the West. Since most printed material was only available in the Dutch language, such studies were commonly called "Dutch learning" (rangaku).[2]
Dutch Japanologist Isaac Titsingh considered Masatsuna to have been his closest friend while he was in Japan, and their correspondence continued after Titsingh last left Dejima for the last time. The oldest surviving letter from Masatsuna to Titsingh dates from 1789;[3] and this letter mentions mutual friends such as Shimazu Shigehide (the father-in-law of the eleventh shōgun, Tokugawa Ienari) and Kuze Hirotami (Nagasaki bugyō or governor of Nagasaki port).[4]
Masatsuna and Titsingh shared an interest in numismatics. After Titsingh was reassigned from Japan in 1784, he sent packages of coins from India—Dutch coppers, as well as coins from India, Russia, Turkey, and Africa. Titsingh in turn received Japanese and Chinese coins as gifts.[2]
Masatsuna was an author of several treatises on numismatics. He was the first in Japan to circulate a book about non-Japanese coins with impressions taken from actual coins which had been obtained from Western traders.
Masatsuna's collection of coins was brought to the UK in the 19th century, and is now in the British Museum and the Ashmolean Museum.[5]
Father: Kutsuki Tsunasada (1713-1788)
Foster Father: Kutsuki Nobutsuna (1731-1787)
Wives:
Ikumanhime, Matsudaira Munenobu’s daughter
Honda Sukemitsu‘s daughter
Ito Nagatoshi’s daughter
Children:
Yuunosuke
Kutsuki Tsunakata (1787-1838), adopted by Tomotsuna
1807 (Bunka 4): Isaac Titsingh sends his last letter to Masatsuna from Europe, not knowing that his old friend had died some years earlier.[8] Titsingh's decided to dedicate his translation of Nihon Ōdai Ichiran to Masatsuna.[12]
Kutsuki's published writings encompass 8 works in 12 publications in 1 language and 25 library holdings.[13]
See Helen Wang, 'How did Kutsuki Masatsuna's coins come to the British Museum?', in Catalogue of the Japanese Coin Collection (pre-Meiji) at the British Museum, with special reference to Kutsuki Masatsuna (British Museum Research Publication 174, 2010).
The private correspondence of Kutsuki Masatsuna and Isaac Titsingh, 1785–1807: compiled in celebration of the friendship between Kutsuki Masatsuna and Isaac Titsingh, Fukuchiyama, November 1992. OCLC 069107485
Catalogue of the Japanese coin collection (pre-Meiji) at the British Museum, with special reference to Kutsuki Masatsuna, by Shin’ichi Sakuraki, Helen Wang and Peter Kornicki, with Nobuhisa Furuta, Timon Screech and Joe Cribb, British Museum Research Publication 174 (2010), ISBN978-086159-174-9.[1]