In addition, in 1134, FUJIWARA no Taishi, who entered into court (Imperial Consort) as the wife of Emperor Toba after he abdicated and retired, became empress ('Kisainomiya') in order to clarify that she is the legally wedded wife of Chiten (emperors or retired emperors).
また、長承3年（1134年）には、鳥羽天皇が譲位して上皇となったあとに入内させた妻である藤原泰子を、治天の正妻であることを明示する目的で皇后（皇后宮）に立てた。