Margaret of Évreux
Margaret of Évreux (c. 1307–1350) was a Capetian princess, daughter of Louis, Count of Évreux, and Margaret of Artois, and sister of Philip III of Navarre.
In 1325, at the castle of Busséol, she married William XII, Count of Auvergne and Boulogne. She was countess of both until 1332. Their daughter Joan I, born in 1326, inherited the two counties.