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Tadamasa faced the daunting task of attempting to reduce the massive debt incurred by his father to the Tokugawa shogunate due to the Great Genroku earthquake and the Hōei eruption of Mount Fuji, and associated aftershocks, crop failures and floods.
He held a number of minor ceremonial posts within the Tokugawa shogunate, but his tenure was noted for a steady deterioration in the state of the domain’s finances, which were still suffering from the after effects of the Great Genroku earthquake and the Hōei eruption of Mount Fuji.