Bettō

Bettō (別当) is a term which originally indicated the head of an institution serving temporarily as the head of another one, but which came to mean also the full-time head of some institution. The Kamakura period samurai Wada Yoshimori, for example, was the first bettō of the shogunate's Samurai-dokoro.

This keyword could refer to multiple things. Here are some suggestions: