Amago clan
Ikenouchi (池の内) in Koda was the site of a battle against the Amago clan on September 26, 1540. The Amago clan was defeated, and it is said that the leader, Yubara Yajirō (湯原弥二郎) committed seppuku there. A monument commemorates the occasion. Koda is also the site of the remains of Goryū castle (五龍城), of the Shishido clan (宍戸氏).The family would become tied to the Mori clan with the marriage of Motonari's eldest daughter to Shishido Takaie (宍戸隆家).