Joan, born abt 1312,was the fifth daughter of Henry Plantagenet (1281-1345), Earl of Lancaster and Leicester and his wife Maud de Chaworth (1282 - 1322). Joan died 7 July 1349, pre-deceasing her husband.
Henry was a grandson of Henry III (1207-1272), his father being Edmund 'Crouchback', 1st. Earl of Lancaster (1244/45-1296) and 4th. child and 2nd. son of Henry III and Eleanor de Provence. Consequently Henry was a nephew of Edward I and cousin to Edward II. His services to Isabella, queen to Edward II, (see page on Joan's husband) were probably in support of her during the coup in the name of Edward III against his mother and Mortimer in 1320.