Mary I of Lusignan (c. 1223 – October 1, 1260) was a Countess of Eu in France. She was a daughter of Raoul II of Lusignan, Count of Eu. Her mother was Yolande de Dreux, daughter of Robert II, Count of Dreux[a] and Yolande de Coucy.[1]
Mary married Alphonso of Brienne about 1250.[2] She became Dame d'Issoudun, Countess of Eu and of Guinness in 1250. Mary died on October 1, 1260 in Melle.[2]
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