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In page Maud of Lancaster, Countess of Ulster:

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Maud was born in about 1310,[citation needed] a daughter of Henry, 3rd Earl of Lancaster and Maud Chaworth.[1] She had an older sister, Blanche, Baroness Wake of Liddell, and four younger sisters, Joan, Baroness Mowbray, Isabel of Lancaster, prioress of Amesbury, Eleanor, Countess of Arundel, and Mary, Baroness Percy. Her only brother was Henry of Grosmont, 1st Duke of Lancaster. His daughter was Blanche of Lancaster, who would in 1359 become the first wife of John of Gaunt, and in 1367 the mother of the future King Henry IV of England.