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Emperor Shirakawa (白河天皇 Shirakawa Tennō) (July 7, 1053 – July 24, 1129) was the 72nd imperial ruler of Japan, according to the traditional order of succession.
Note: there's also a theory that Shirakawa was the actual father of Emperor Sutoku, officially the son of Emperor Toba, Shirakawa's grandson.
Shirakawa was still alive when Toba abdicated in turn to his son, who became Emperor Sutoku.