Joan of Lancaster (c. 1312 – 7 July 1349) sometimes calledJoan Plantagenet after her dynasty's name, was the third daughter ofHenry, 3rd Earl of Lancaster andMaud Chaworth.

Joan of Lancaster was bornc. 1312 atGrosmont Castle inMonmouthshire.^[1] Her father was the son ofEdmund Crouchback, 1st Earl of Lancaster andBlanche of Artois, Queen Dowager ofNavarre, a granddaughter ofLouis VIII of France andBlanche of Castile. Her paternal great-grandparents wereHenry III of England andEleanor of Provence. Joan was thus doubly descended fromHenry II andEleanor of Aquitaine.^[2]

Joan's mother was a half-sister ofEdward II's favorite,Hugh le Despenser the Younger, through the remarriage of Maud's mother,Isabella de Beauchamp, toHugh le Despenser, 1st Earl of Winchester. Joan had one brother,Henry of Grosmont, 1st Duke of Lancaster, and five sisters,Blanche, Baroness Wake of Liddell, Isabel, Abbess ofAmesbury,Maud, Countess of Ulster, Eleanor, Countess of Arundel and Warenne, and Mary, Baroness Percy.^[3]

Joan's niece,Elizabeth de Burgh, Countess of Ulster, marriedLionel of Antwerp, Duke of Clarence, the second surviving son ofEdward III andPhilippa of Hainault, a marriage that would create a line of descent to strengthen theYorkist claim to the throne in theWars of the Roses.^[4] Another niece,Blanche of Lancaster, married the third surviving son of Edward III,John of Gaunt, and became the mother of the firstLancastrian king of England,Henry IV.^[5]

Joan marriedJohn de Mowbray, 3rd Baron Mowbray on 28th of February 1327.^[6] They had three children:^[7]

• Blanche de Mowbray (died 1409), who was married five times - first, to John de Segrave; second, to Robert Bertram; third, to Thomas Poynings; fourth, to Sir John Worth; and fifth, to Sir John Wiltshire.
• Eleanor de Mowbray (d. 29 June 1387),^[6] who was married twice - first, toRoger la Warr, 3rd Baron De La Warr (1326-1370)^[6] as his third wife,^[6] before 23 July 1358;^[6] and second, to Sir Lewis de Clifford.
• John de Mowbray, 4th Baron Mowbray (25 June 1340 – 1368), married Elizabeth de Segrave

Joan died inYorkshire, England of theplague. She was interred atByland Abbey inNorth Yorkshire.

Works cited

• Archer, Rowena E. (2004). "Mowbray, John (II), third Lord Mowbray (1310–1361)".Oxford Dictionary of National Biography (online ed.). Oxford University Press.doi:10.1093/ref:odnb/19451. (Subscription,Wikipedia Library access orUK public library membership required.)
• Weir, Alison (2008).Britain's Royal Families, The Complete Genealogy. Vintage Books.ISBN 978-0-09-953973-5.

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