Thomas Beaufort1377 - 1426 Born 1377 Château de Beaufort, Beaufort Died Sun, 31 December 1426 Palace of Placentia, Greenwich Buried Bury St Edmunds Abbey, Bury St Edmunds Details Parents Duke of Exeter Thomas Beaufort Lived 49 years, 5 months, 30 days father John of Gaunt 1340 - 1399 mother Katherine Swynford 1350 - 1403 Siblings Brother John Beaufort 1371 - 1410 Brother Henry Beaufort 1375 - 1447 Sister Joan Beaufort 1379 - 1440