Margaret of Blois

Margaret of Blois (1170–1230) was the daughter of Count Theobald V and Alix of France. She married first Hugh III of Oisy and then, in 1190, Otto I, count of Burgundy. Widowed in 1200, she ruled Burgundy as regent for her daughters until 1208; Joan I and Beatrice II both succeeded her.

Her third husband was Walter II of Avesnes. In 1218 her nephew Theobald VI died and she became countess of Blois and Châteaudun, succeeded in 1230 by her daughter Mary.