Kobayakawa Hideaki
In 1600 at the Battle of Sekigahara, at the start Mototsuna took part in Ishida Mitsunari's force belonging to Otani Yoshitsugu. However, acting in concert with Kobayakawa Hideaki, Mototsuna, along with Wakisaka Yasuharu, Ogawa Suketada and Akaza Naoyasu, betrayed Mitsunari. After the battle, Ieyasu let Yasuharu govern his domain because of this exploit.