Joan of Lancaster English noble (1312–1349) Parents Maud Chaworth Henry, 3rd Earl of Lancaster Children John de Mowbray, 4th Baron Mowbray Eleanor de Mowbray Blanche de Mowbray Siblings Mary of Lancaster Maud of Lancaster, Countess of Ulster Blanche of Lancaster Eleanor of Lancaster Henry of Grosmont, 1st Duke of Lancaster Isabel of Lancaster Partners John de Mowbray, 3rd Baron Mowbray