Princess Muneko

, later known as Jōsaimon-in , was a princess and an honorary Empress of Japan.

She was the daughter of Emperor Toba and Fujiwara no Tamako. She served as Saiin at Kamo Shrine in 1127–1132. She retired from her service as priestess for health reasons. She served as honorary interim empress of her nephew Emperor Nijō awaiting the appointment of a permanent empress. She retired when her nephew married his aunt, her half-sister Princess Yoshiko.

In 1160, following her mother's example, she was ordained as a Buddhist nun at Hōkongō-in. She lived at Hōkongō-in until forced to relocate in 1181 due to a fire.

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