Den was born in Tamba-Kaibara Domain, located in Hikami District of Tamba Province (part of the modern-day city of Tamba, Hyōgo), where his father was a wealthy farmer and landholder.
1782 (Tenmei 2): An analysis of silver currency in China and Japan "Sin sen sen pou (Sin tchuan phou)" was presented to the emperor by Kutsuki Masatsuna (1750–1802), also known as Kutsuki Oki-no kami Minamoto-no Masatsuna, hereditary daimyo of Oki and Ōmi with holdings in Tamba and Fukuchiyama – related note at Tenmei 7 below.
Its name comes from the first syllable of Kyōto and the former town of Tamba, a namesake of the historic Tamba Province.
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