Isabel of Beaumont Grandmother of Henry IV of England (1320–1361) Parents Alice Comyn, Countess of Buchan Henry de Beaumont, 1st Baron Beaumont Children Blanche of Lancaster Maud, Countess of Leicester Siblings Elizabeth Beaumont John de Beaumont, 2nd Baron Beaumont Richard Beaumont Joan Beaumont Catherine de Beaumont Beatrice Beaumont Thomas Beaumont John Beaumont Alice Beaumont Partners Henry of Grosmont, 1st Duke of Lancaster