Isabel de Mowbray (died 1452) (d. 1452) Parents Elizabeth FitzAlan Thomas de Mowbray, 1st Duke of Norfolk Children Maurice Berkeley, 3rd Baron Berkeley James Berkeley unknown daughter Berkeley unknown daughter Berkeley Isabel Berkeley Alice Berkeley William de Berkeley, 1st Marquess of Berkeley Thomas Berkeley Elizabeth Ferrers, 6th Baroness Ferrers of Groby unknown daughter Berkeley Siblings Elizabeth de Mowbray John de Mowbray, 2nd Duke of Norfolk Elizabeth Goushill Margaret de Mowbray Thomas de Mowbray, 4th Earl of Norfolk Joan Goushill Partners James Berkeley, 1st Baron Berkeley Henry Ferrers