Margaret Beaufort, Countess of Somerset Countess of Somerset, died 1439 (1385–1439) Parents Alice Holland, Countess of Kent Thomas Holland, 2nd Earl of Kent Children John Beaufort, 1st Duke of Somerset Margaret Beaufort, Countess of Devon Thomas Beaufort, Count of Perche Edmund Beaufort, 2nd Duke of Somerset Joan Beaufort Henry Beaufort, 2nd Earl of Somerset Siblings Edmund Holland, 4th Earl of Kent Thomas Holland, 1st Duke of Surrey Alianore Holland, Countess of March Eleanor Holland, Countess of Salisbury Joan Holland Elizabeth Holland Partners William Neville, Earl of Kent John Beaufort, 1st Earl of Somerset Thomas of Lancaster, 1st Duke of Clarence
