Charge

From SuspireWiki

(n., formal)

A vassal’s official responsibility to her lord or the Prince; her duty. One’s charge is often, but not always, the act of her corvée (q.v.). For example, a Herald’s charge is to spread the Prince’s word, though she could owe a monthly corvée to her lord (who may or may not be the Prince) in exchange for a domain. “You are charged with keeping the border of 7th Street closed, Gough, and we’ll both be sorry things if you fail.”