Marie of Brienne

Marie of Brienne (c. 1224–1275), also called Marie d'Acre, was the daughter of John of Brienne, king of Jerusalem and Latin emperor of Constantinople, and Berengaria of León. In 1234 she married Baldwin II of Courtenay, her father's junior co-emperor, becoming Latin empress at about ten.

She governed Constantinople as regent during Baldwin's long fundraising journeys in the West in 1237–1239 and again from 1243, and later defended the Courtenay lands at Namur.

Her son Philip was born in 1243. She died in exile in 1275 after Constantinople fell to the Nicaeans in 1261.