When Jing Ke set out to assassinate the King of Qin, Prince Dan saw him off on the bank of the Yi River.
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At the farewell Jing Ke (荆轲) sang the two-line 易水歌, the Song of the Yi River: 风萧萧兮易水寒,壮士一去兮不复还, 'the wind soughs and the Yi River runs cold; the brave man goes and will not return'. He failed, and was killed at the Qin court in 227 BC.