Wikipedia definition
1. Kutsuki Masatsuna, also known as Kutsuki Oki-no kami Minamoto-no Masatsuna, was a hereditary Japanese daimyo of Oki and Ōmi with holdings in Tamba and Fukuchiyama. His warrior clan was amongst the hereditary vassals of the Tokugawa family in the Edo period 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".
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