Background
Harusato was born at the Matsudaira residence in Edo (present-day Tokyo) in 1751, the second son of Matsudaira Munenobu, who then ruled Matsue. Harusato succeeded his father, Munenobu, as lord of the Izumo Matsue fief when his father, the 6th-generation lord of the fief, retired in the 6th year of the Meiwa era (1769).
Career
He was renowned as a tea master, under the name Matsudaira Fumai (松平 不昧). By then, due largely to contributions ordered by the bakufu for the repair of Enryaku-ji temple, the fief had been reduced to a state of poverty. With the support of his chief retainer, Asahi Tamba, Harusato set about reversing the situation quickly by increasing production of the fief"s major products and making the rice paddy area of the fief more secure by the promotion of flood control.
In terms of the history of chanoyu, with the advent of the Tokugawa period in 1615, the fashion of samurai personally practicing chanoyu lost its attraction.
Chanoyu lost its function as a focal point for political ties among the samurai. From about the middle of the 18th century, however, the old-guard samurai who had scorned chanoyu as the idle game of indolent men of leisure had died.
By this time, many of the new generation of daimyō were rising as leaders in the development of urban culture. Matsudaira Harusato was outstanding among them.
As he was early into his mission of restoring the finances and government of his fief, Harusato in 1770 wrote a treatise titled Mudagoto, apparently in opposition to his main retainer Asahi Tamba who criticized him for use of fief funds toward chanoyu.
In the Mudagoto, Harusato states: "Making chanoyu a luxury, exhausting beauty to make it splendid is a distressful thing.. rather, it can be made an adjutant to governing the country well."
He was also privy to a copy of the Nanpōroku (南方録) record of the chanoyu teachings of Senator Rikyū, from Arai Itsushō (1726-1804), who was a tea devotee in Edo in the chanoyu tradition of Hosokawa Tadaoki (aka Hosokawa Sansai). In Japanese
Nagao, Ryō (2001).
Shinsetsu Matsudaira Fumai 真說松平不昧.
Tokyo: Hara Shobō.