Margaret I (c. 1145 – died 15 November 1194) was the countess of Flanders suo jure from 1191 to her death.
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Early life
Margaret was the daughter of Count Thierry of Flanders and Sibylla of Anjou.
In 1160 she married Count Ralph II of Vermandois, son of Ralph I and known as Ralph the Younger. Due to his leprosy, the marriage could not be consummated and remained childless. He died of leprosy in 1167 without issue.
In 1169 she married Count Baldwin V of Hainaut, a scion of the House of Flanders.
Countship
In 1191, Margaret's brother Count Philip I of Flanders died childless, as his heir she claimed the county of Flanders with the support of her husband. Her claim was questioned by the king of France who, with support of Ghent, declared Flanders escheated to the crown due to the lack of male heirs, a problem that was not solved until the Treaty of Arras by the mediation of the archbishop of Reims. They met some unrest among the nobility of the area, foremost by her brother's widow, Theresa of Portugal, who was given extensive dower lands in the coastal and southern Flanders where she provoked considerable unrest by high taxation.