| Princess Reishi Japanese: 姈子内親王 | |
| Succession: | Empress consort of Japan |
| Reign: | 19 September 1285 – 5 September 1291 |
| Reign-Type: | Tenure |
| Royal House: | Imperial House of Japan |
| Father: | Emperor Go-Fukakusa |
| Mother: | Fujiwara no Kimiko |
| Birth Date: | 5 October 1270 |
| Birth Place: | Heian-kyō (Kyōto) |
| Death Place: | Heian-kyō (Kyōto) |
Princess Reishi (姈子内親王; 5 October 1270 – 22 August 1307), later Yūgimon'in (遊義門院), was an Empress of Japan, married to her cousin Emperor Go-Uda.[1] Go-Uda was known for his devotion to her.
She was the daughter of Emperor Go-Fukakusa and Fujiwara no Kimiko. She was named Empress to her cousin in 1285.[2] By the time she was 30, her husband had retired from being Emperor, and around the same age she was given the name Yugimon-in.
in 1307, she became ill, and soon died, which affected her husband so deeply that he took Buddhist vows and became a devoted monk.[3]