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As the only ruler of Yan, Liu Shouguang was noted for his cruelty. The state of Yan was therefore sometimes referred to as Jie Yan, in reference to the tyrannical ruler Jie of the Xia dynasty.
References
Mote, F.W. (1999). Imperial China (900-1800). Harvard University Press. p. 16. ISBN0-674-01212-7.