Mogami clan
Tozawa Masamori, the daimyō of Hitachi-Matsuoka Domain (40,000 koku) was transferred to Dewa Province in September 1622 following the suppression of the Mogami clan by the Tokugawa shogunate and gained an increase in revenues to 60,000 koku. His new territory extended over all of what is now Mogami District and a portion of Murayama District in what is now Yamagata Prefecture. Finding the ancient hill-top Sakenobe Castle to be too small and inconveniently located, he successfully petitioned the shogunate for permission to construct a new castle in the flatlands with a main bailey, secondary bailey to the south, all surrounded by a third bailey and wet moats.