Family: 1st Duke Of Lancaster John Plantagenet / Duchess Of Lancaster Katherine De Roet (F1071)
m. 19 May 1359
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Male
1st Duke Of Lancaster John Plantagenet
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 King of England Edward Plantagenet | F4544 Group Sheet Mother Queen of England Phillipa D'Avesnes Of Hainault | F4544 Group Sheet
Female
Duchess Of Lancaster Katherine De Roet
Birth Abt 25 Nov 1350 Germany Death 10 May 1403 Lincolnshire, England Burial May 1403 Lincolnshire, England Father Paon De Roet | F864 Group Sheet Mother Catherine Davesnes | F864 Group Sheet
Male
+ King of England Henry Plantagenet, IV
Birth 3 Apr 1367 Lincolnshire, England Death 20 Mar 1413 Middlesex, England Burial 1413 Kentshire, England Spouse Countess of Derby Mary de Bohun | F8131 Marriage 27 Jul 1380 Sussex, England
Male
+ 1st Earl of Somerset John Beaufort Of Gaunt Plantagenet
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 Duchess Of Clarence Margaret Holland | F3673 Marriage 23 May 1399 Netherlands
Female
+ Countess of Westmorland Joan Beaufort
Birth 29 Jan 1375 Champagne, France Death 13 Nov 1440 Yorkshire, England Burial 16 Nov 1440 Lincolnshire, England Spouse 1st Earl of Westmorland Ralph Neville | F805 Marriage 1382 Staffordshire, England