Sun Shangxiang, also known as Lady Sun, was the younger sister of Sun Quan, the monarch of the Eastern Wu kingdom. In history, her marriage to Liu Bei was a political alliance aimed at strengthening the relationship between Liu Bei and Sun Quan.

In the 14th year of Jian'an (209), Liu Bei visited Sun Quan and requested reinforcements to fight against Cao Cao. During this time, Sun Quan proposed to marry his younger sister Sun Shangxiang to Liu Bei in order to strengthen the relationship between the two families. Liu Bei accepted the proposal and married Sun Shangxiang the following year. This marriage was obviously a political strategy aimed at consolidating the alliance between the two parties through marriage.

However, there is no clear record in history regarding the ending of Sun Shangxiang's life. The "Records of the Three Kingdoms" does not provide much description about her, only mentioning her marriage to Liu Bei and their subsequent separation. The "Romance of the Three Kingdoms" depicts her returning to the Eastern Wu kingdom after Liu Bei's death. However, these are fictional depictions in the novel and not historical facts.

Overall, Sun Shangxiang's marriage to Liu Bei was a political alliance aimed at strengthening the alliance between Liu Bei and Sun Quan. As for her ending, there is no clear record in history, and we can only speculate based on the descriptions in the "Records of the Three Kingdoms" and the "Romance of the Three Kingdoms".

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