Jugo was given to the lady of Emperor, the Imperial Family, kugyo (aristocrats), the Shogun family and high priests for the purpose of receiving nenkan (a rank given to the emperor's wives), nenshaku (a right to be bestowed a rank) and fuko, all of which were equal to those of sango, in order to favor them economically.
准后は三后に準じた年官・年爵・封戸を賜り、経済的に優遇する目的で天皇の夫人、皇族、公卿、将軍家、高僧に与えられた。