The Imperial Prince Sukehito was given the honorary name of the Emperor Keiko (also called Keikoin) and the honorary title of Daijo Tenno in 1884, because he was a direct ancestor of the Meiji Emperor (the Meiji Emperor was the great-great-grandson of the Imperial Prince Sukehito).
典仁親王は1884年（明治17年）に明治天皇の直接の祖先にあたる（明治天皇は典仁親王の玄孫）ということで、慶光天皇（慶光院とも）の諡号と太上天皇の称号が贈られている。