John of Gaunt
John Plantagenet - Prince of England
Created Earl of Richmond (1342) and Earl of Lancaster by right of his first wife (1361)
Duke of Lancaster (1362 - 1399)
Titular King of Castile and Leon (1371 - 1388) by right of his second wife
Duke of Aquitaine (1390 - 1399)
Born (March, 1340) in the Abbey of St Bavon in Ghent, Flanders - Died (Feb 3, 1399) at Leicester Castle, London
Buried within Old St Paul's Cathedral, London

Father - Edward III of England
Mother - Philippa of Hainault

John of Gaunt married firstly (May 19, 1359) at Reading Abbey in Berkshire Blanche of Lancaster
Children :

• Philippa of Lancaster
• John of Lancaster
• Elizabeth of Lancaster
• Edward of Lancaster
• John of Lancaster
• Henry IV of England
• Isabella of Lancaster

John of Gaunt married secondly at Roquefort, Guienne (Sept 21, 1371) to Constance of Castile (2)
Children :

• Catherine of Lancaster
• John of Lancaster

John of Gaunt married thirdly (Jan 13, 1396) in Lincoln Cathedral to (his former mistress) Katherine de Roet (link)
His children by Katherine were legitimated (Sept 1, 1396) by Pope Boniface IX
Richard II also recognized the Beauforts as legitimate but they were excluded from the succession
Children :

• John Beaufort
• Henry Beaufort
• Thomas Beaufort
• Joan Beaufort