Emperor Gong of Jin

Emperor Gong of Jin, personal name Sima Dewen, was the last emperor of the Eastern Jin Dynasty (265-420) in China. 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. In 420, under pressure from Liu Yu, he yielded the throne to Liu Yu, ending Jin's existence. 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.