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She became empress in 827. Her husband abdicated in 833. Either when she was widowed in 840, or when her son was deposed as crown prince in 842, Seishi followed the example of her mother and became a nun: she retired to the palace of her late spouse, Junna'in, which she made in to a family convent, engaging in sponsoring lectures of the Lotus Sutra and providing care for orphans.
[3][4]
Unless otherwise noted (as BC), years are in CE / AD1 individuals that were given the title of empress posthumously
2 individuals elevated to the rank of empress due to their position as honorary mother of the emperor
3 Shōshi served briefly as honorary empress for her younger brother Emperor Go-Daigo
Unless otherwise noted (as BC), years are in CE / AD1 individuals that were given the title of empress dowager posthumously
2 title removed in 896 due to a suspected affair with head priest of the Toko-ji Temple; title posthumously restored in 943
3 was made High Empress or de jure empress dowager during her husband's reign