Matilda of Béthune (died 8 November 1264), was a noblewoman from Artois who became countess of Flanders by marriage to Guy, Count of Flanders. She was heiress to her father's titles as Lady of Béthune, of Dendermonde, of Richebourg and of Warneton, as well as Advocatess of the Abbey of Saint Vaast at Arras, and the ruler of these states in 1248–1264. She was the mother of Robert, Count of Flanders, known as Robert of Béthune after his mother.
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Life
Matilda was born about 1230, the first child of Robert VII, and Elizabeth, daughter of Arnulf IV, last Lord of Morialmé.
Countess
Matilda was engaged to Guy of Dampierre, who was made co-ruler of Flanders by his widowed mother Margaret II, Countess of Flanders alongside her and his elder brother William III of Dampierre, who died in 1251. In recognition of this important match for his eldest daughter, Robert of Béthune endowed her with the major part of his lands and titles.
In October 1245, Matilda still under age and unmarried, was made heir to the ancient lands of his ancestors outside Béthune, the Pays de l'Alleu in which he held power of life and death. The marriage contract was signed on 2 February 1246 and the wedding then took place in Béthune. On 24 June 1248 Robert and Elizabeth wrote a letter to Guy and Matilda confirming that the two would inherit his lands and titles, which happened shortly after when news reached France of Robert's death.