After the defeat of the Baekje restoration movement led by Boksin and Dochim at the Battle of Baekgang, which had sought to place Yung's brother Buyeo Pung on the throne, Tang felt the need for a ruler who could pacify the Baekje area.
Beginning in 664, Buyeo Yung served briefly as the governor of the Ungjin Commandery (웅진도독부; 熊津都督府) which Tang established to oversee the former territory of Baekje.
After Silla expelled Tang forces from the Korean peninsula in 676, Buyeo Yung returned to Luoyang, where he spent the rest of his days.
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