Margaret I, Countess of Flanders

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Margaret I of Alsace (died November 15, 1194) was countess of Flanders from 1191 to her death. She was the daughter of Thierry, Count of Flanders and Sibylla of Anjou, and the heiress of her childless brother, Philip of Flanders.

In 1169 she married Baldwin V, Count of Hainaut, who became her co-ruler. They had the following issue:

• Isabelle of Hainaut (Valenciennes, April 1170 – March 15, 1190, Paris), married king Philip II of France
• Baldwin VI of Hainaut (1171–1205), also count of Flanders and Latin Emperor
• Yolanda of Flanders (1175–1219), married Peter of Courtenay, Latin Emperor
• Philip I, Marquis of Namur (1175–1212)
• Henry of Flanders (1176–1216), Latin Emperor
• Sybille (1179 – January 9, 1217), married c. 1197 Guichard IV, Sire de Beaujeu (d. 1216)
• Eustace (d. 1219), regent of the Kingdom of Thessalonica
• Godfrey

Preceded by Philip

Count of Flanders 1191–1194 with Baldwin VIII (1191–1194)

Succeeded by Baldwin VIII