Format of naming convention in English is under discussion at Wikipedia talk:Naming conventions (Chinese) and Wikipedia talk:Naming conventions (Chinese)/monarchical titles.
Emperor Gong of Jin China (晋恭帝, 晉恭帝, Pinyin Jìn Gōngdì, Wade-Giles Chin Kung-ti) was last emperor of the Eastern Jin Dynasty (265-420) in China. He was assassinated under the order of Liu Yu, founder of the Song Dynasty (420-479).
He became emperor in 419 after his developmentally disabled brother Emperor An was killed by the regent Liu Yu, and during his brief reign, actual power was in Liu Yu's hands.
Liu Yu founded Liu Song, and in 421, believing that the former Jin emperor posed a threat to his rule, had him asphyxiated with a blanket.
Sima Dewen was born to Emperor Xiaowu of Jin and his concubine Consort Chen Guinü in 386, as their second son, four years after Consort Chen had given birth to their oldest son, Sima Dezong.