however, after the 1600 Battle of Sekigahara, the Tokugawa shogunate deprived the Mōri of two-thirds of their holdings, reducing the clan to the two provinces of Nagato and Suō.

Iwami became part of the holdings of Sakazaki Naomori, one of Tokugawa Ieyasu's generals, who established his seat at Tsuwano.

In 1648, his son Furuta Shigetsune was enraged when he found that his senior retainers had made arrangements to adopt an heir from a cadet branch of the clan without his authorization and had them executed.

He stayed for ten years, and was transferred to Okazaki Domain, where he exchanged places with Matsudaira (Matsui) Yasuyoshi.

He traced his ancestry to a younger brother of Tokugawa Ienobu and the domain was thus a strong supporter of the shogunate in the Bakumatsu period.

The shogunate agreed to make up the shortfall to officially qualify him as daimyō and he ruled Tsuruta to the Meiji restoration.