Princess Teishi

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Princess Teishi (禎子内親王, Teishi Naishinnō, August 15, 1013 – February 3, 1094), also known as Yōmeimon-in (陽明門院), was an empress consort of Emperor Go-Suzaku of Japan. She wielded major influence during the reign of her son, Emperor Go Sanjo (1068-1073), but she was de facto ruler from 1073 to 1094, during the early reign of Emperor Shirakawa.