John de Mowbray, 4th Baron Mowbray English Baron (1340–1368) Parents John de Mowbray, 3rd Baron Mowbray Joan of Lancaster Children Thomas de Mowbray, 1st Duke of Norfolk Eleanor de Mowbray John de Mowbray, 1st Earl of Nottingham Margaret de Mowbray Joan Mowbray Siblings Blanche de Mowbray Eleanor de Mowbray Partners Elizabeth Segrave