Joan of Lancaster

Joan of Lancaster (c. 1312–1349) was the third daughter of Henry, 3rd Earl of Lancaster, and Maud de Chaworth. In 1327 she married John de Mowbray, 3rd Baron Mowbray; their children included John de Mowbray, 4th Baron Mowbray.

Her brother Henry of Grosmont was father of Blanche of Lancaster, wife of John of Gaunt and mother of Henry IV. Joan died of the plague in Yorkshire in 1349 and was buried at Byland Abbey.