Since then, it became an established custom that the title of Jugo was given to the emperor's relatives such as to a lady who could not be ranked in the position of an empress because of her mean birth, even though she was the emperor's real mother, a maternal relative, the father of a nyogo (imperial consort), and so forth, with treatment equal to Jugo after being declared Jugo and Sangu by the emperor.
以後、天皇の生母でありながら、卑しい氏族であったことから后位につけなかった夫人、外戚、女御の父など天皇の縁戚に与えられるのが恒例となり、准后宣下ないし准三宮宣下として准后の待遇が与えられた。