Among them, Imperial Princess Senshi was called "Dai Saiin" (Great Saiin Priestess) because she actually had the longest tenure of Saiin over 5 emperors of fifty-six years (from the times of Emperor Enyu to Emperor Goichijo).
中でも、歴代最長の選子内親王は実に5朝（円融天皇朝から後一条天皇朝まで）56年間の長きに渡って斎院をつとめたことから“大斎院”と称された。