Joan of Bar

Joan of Bar (c. 1295–1361), daughter of Henry III, Count of Bar, and Eleanor, was a niece of Edward II. In 1306 she married John de Warenne, 7th Earl of Surrey, who from 1313 vainly sought a divorce while keeping a mistress; Edward II lodged her at the Tower of London.

In 1352 John II made her regent of Bar for her great-nephew Robert. She ruled until 1356, when defeat at Poitiers lost her support, then returned to England and died in 1361.