酒井氏
Following the Battle of Sekigahara in 1600, the victorious Tokugawa Ieyasu assigned the province to Kyōgoku Takatsugu, as "daimyō" of the 92,000 "koku" Obama Domain. Kyōgoku Takatsugu began the construction of Obama Castle and rebuilt the ancient port town as a "jōkamachi" and a centre for the "kitamaebune" coastal trade network. The Kyōgoku clan were transferred to Izumo Province in 1634 and were replaced by Sakai Tadakatsu, an important retainer of the shogunate, who had served as "Tairō" under shōgun Tokugawa Iemitsu and Tokugawa Ietsuna. The Sakai clan continued to rule Obama for fourteen generations over 237 years to the end of the Edo period.