太上皇用英语怎么说

empera's father who abdicated in favour of his son

empera's father 太上皇

太上皇

[拼音]：tài shànɡ huánɡ
[解释]：
1.a title assumed by an emperor's father who abdicated in favor of his son
2.an overlord;
a supreme ruler
[参考词典]：汉英综合科技大辞典

emperor emeritus