Green Plum Boiled Wine on Heroes was a legend in ancient China that was considered to be the predecessor of Romance of the Three Kingdoms. The story was about Liu Bei, Guan Yu, and Zhang Fei discussing the general trend of the world under the green plum tree and commenting on heroes, thus forming a deep friendship and trust. The authenticity of this story is disputed because of the lack of conclusive historical evidence. However, this story was widely spread and became a classic legend in Chinese culture.