The Emperor Shirakawa of Japan reference article from the English Wikipedia on 24-Apr-2004
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Emperor Shirakawa of Japan

Emperor Shirakawa (白河天皇) was the 72th imperial ruler of Japan and the first to ostensibly retire to a monastery, but in fact to continue to exert influence over his successor. This process would become known as cloistered rule.

Lived: 1053-1129
Ruled: 1073-1087
Cloistered rule: 1086-1129

Preceded by:
Go-Sanjo
Emperor of Japan Succeeded by:
Horikawa