Ancient Chinese historical sources describe Jia Xia “as thrice a queen and seven times a wife. Probably a native of the state of Zheng, she was the wife of Xia of Chen.” The account by the early author Shuji, “Xia Ji killed three husbands, one ruler, and one son, and ruined one state and two ministers.”
[Lisa Ann Raphals, Sharing the Light: Representations of Women and Virtue in Early China, SUNY press, 1998, p. 67, ancient source cited Zuo, Zhao 28.2, pp. 1492-3.]
For links to other cases of woman who murdered 2 or more husbands (or paramours), see Black Widow Serial Killers.