太上天皇
also: だじょうてんのう · たいじょうてんのう · おおきすめらみこと
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Meanings
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abdicated emperor; retired emperor
Historical title for an emperor who has abdicated in favor of a successor. Honorific term used in the context of the Japanese imperial court.
Daijō Tennō is a title given to an emperor who has abdicated.
During the Heian period, many retired emperors ruled from behind the scenes.