Margaret I of Flanders

Margaret I
Margaret, Countess of Flanders
Spouse(s)	Ralph II, Count of Vermandois Baldwin V, Count of Hainaut
Noble family	House of Metz
Father	Thierry, Count of Flanders
Mother	Sibylla of Anjou
Died	15 November 1194(1194-11-15)
Buried	St. Donatian's Cathedral in Bruges

Margaret I (died 15 November 1194) was countess of Flanders suo jure 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 1160 she married Ralph II, Count of Vermandois. He died of leprosy in 1167 without issue.

In 1169 she married Baldwin V, Count of Hainaut, her third cousin once removed, who became her co-ruler when she gained the county of Flanders in 1191. They had the following issue:

Margaret died on 15 November 1194; thereafter her husband was sole count of Flanders.