Family: John Plantagenet, 1st Duke Of Lancaster / Katherine De Roet, Duchess Of Lancaster (F1052)
m. 19 May 1359
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Male
John Plantagenet, 1st Duke Of Lancaster
Birth 6 Mar 1340 Nord-Pas-De-Calais, France 
Christening 24 Jun 1340 Nord-Pas-De-Calais, France Death 3 Feb 1399 Leicestershire, England Burial 15 Mar 1399 London, England Marriage 19 May 1359 Berkshire, England Father Edward Plantagenet, King of England | F4452 Group Sheet Mother Phillipa D'Avesnes Of Hainault, Queen of England | F4452 Group Sheet
Female
Katherine De Roet, Duchess Of Lancaster
Birth Abt 25 Nov 1350 Germany Death 10 May 1403 Lincolnshire, England Burial May 1403 Lincolnshire, England Father Paon De Roet | F845 Group Sheet Mother Catherine Davesnes | F845 Group Sheet
Male
+ Henry Plantagenet, King of England
Birth 3 Apr 1367 Lincolnshire, England Death 20 Mar 1413 Middlesex, England Burial 1413 Kentshire, England Spouse Mary de Bohun, Countess of Derby | F7989 Marriage 27 Jul 1380 Sussex, England
Male
+ John Beaufort Of Gaunt Plantagenet, 1st Earl of Somerset
Birth Abt 1373 Maine-Et-Loire, France Christening Aft 29 Jan 1373 Maine-Et-Loire, France Death 16 Mar 1410 London, England Burial Mar 1410 Kentshire, England Spouse Margaret Holland, Duchess Of Clarence | F3638 Marriage 23 May 1399 Netherlands
Female
+ Joan Beaufort, Countess of Westmorland
Birth 29 Jan 1375 Champagne, France Death 13 Nov 1440 Yorkshire, England Burial 16 Nov 1440 Lincolnshire, England Spouse Ralph Neville, 1st Earl of Westmorland | F786 Marriage 1382 Staffordshire, England