Tanomonosuke OISHI was a roshin (old or key retainer) who was a guardian of Yoshio OISHI, who became Hitto karo (the head of chief retainers) young, and assisted Naganori Asano, who was a young lord of the domain, governing the politics of Ako Domain actually instead of the two.
大石頼母助は若くして筆頭家老になった大石良雄の後見人をつとめ、また幼少の藩主浅野長矩を補佐し、二人に代わって赤穂藩政を実質的に執ってきた老臣である。