“Former emperor” in Japanese
Short answer
Former emperor in Japanese is “院号” (ingou). Full meaning: former emperor (or his empress, imperial princesses, etc.); posthumous Buddhist name containing the character "in".
Other ways to say “Former emperor” in Japanese
上皇
joukou retired emperor, ex-emperor, former emperor, emperor emeritus
上皇陛下
joukouheika retired emperor, ex-emperor, former emperor, emperor emeritus
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