During the retreat from the Bunroku/Keicho invasions, the daimyo Matsuura Shigenobu who governed the Hirado Domain (present-day Mikawachi-cho) also brought back a potter known as Koseki. Although the Hirado Domain was already known for its pottery, Koseki’s son Imamura Sannojo became the central focus of the region and he also began production of porcelain.