Earl of Richmond, Earl of Derby, Earl of Lancaster, Lord of Beaufort and Nogent, Earl of Lincoln, Earl of Leicester, Earl of Derby, Duke of Lancaster, Lord de Bergerac et Roche-sur-Yon, Duke of Aquitaine John de Gaunt

1340 - 1399  (~ 57 years)

Earl of Richmond, Earl of Derby, Earl of Lancaster, Lord of Beaufort and Nogent, Earl of Lincoln, Earl of Leicester, Earl of Derby, Duke of Lancaster, Lord de Bergerac et Roche-sur-Yon, Duke of Aquitaine John de Gaunt 1340 - 1399 Katherine Roët 1350 - 1403 1st Earl of Somerset, 1st Marquess of Somerset, 1st Marquess of Dorset John de Beaufort 1373 - 1410 Dean of Wells Cathedral, See of Lincoln, Bishop of Lincoln, Bishop of Winchester, Cardinal-Priest of St. Eusebius Henry de Beaufort Abt 1376 - 1447 Earl of Dorset, 1st Duke of Exeter, Lord of Lillebonne, Count of Harcourt Sir Thomas de Beaufort Abt 1377 - 1426 Countess of Westmorland, Lady Companion, Order of the Garter Lady Joan de Beaufort 1379 - 1440