Tateyama Domain

Tateyama Domain (館山藩, Tateyama-han^?) was a feudal domain under the Tokugawa shogunate of Edo period Japan, located in Awa Province (southern modern-day Chiba Prefecture), Japan. It was centered on Tateyama Castle in what is now the city of Tateyama, Chiba.

Most of the Bōsō Peninsula was controlled by the powerful Satomi clan during the Sengoku period. The Satomi fought numerous battles with the Late Hōjō clan of Odawara for control of the Kantō region. In 1580, Satomi Yoriyoshi built Tateyama Castle in southern Awa Province to guard the southern portion of his territories and increase his control over the entrance to Edo Bay. The castle of rebuilt by his son, Satomi Yoshiyasu in 1588.

Following the Battle of Odawara in 1590, Toyotomi HIdeyoshi assigned the Kantō region to Tokugawa Ieyasu, who confirmed the Satomi as daimyō of Awa and Kazusa Provinces, with revenues of 92,000 koku. Following the Battle of Sekigahara, Satomi Yoshiyasu also gained control of Kashima District in Hitachi Province, which increased his holdings to 122,000 koku. After his death in 1603, the domain was inherited by his son, Satomi Tadayoshi. However, Tadayoshi was related by marriage to Ōkubo Tadachika, and was implicated in the Ōkubo Nagayasu Incident of 1614, which the Tokugawa shogunate used as excuse to abolish Tateyama Domain.