Tombs of Katherine Swynford and her daughter Joan Beaufort- c.1640 - The three preceding houses of English sovereigns from 1399, the Houses of Lancaster, York and Tudor, were descended from John of Gaunt through, Henry Bolingbroke, Joan Beaufort and John Beaufort.
JOHN BEAUFORT of GAUNT "Duke of Aquitaine, 1st Duke of Lancaster, King of Castile" Plantagenet 1340-1399 . Son of King Edward III and Philippa of Hainault. His wife was Catherine Swynford Princess and Duchess of Lancaster Roet. John was not only one of the richest men in his era, but also one of the wealthiest men to have ever lived. Taking into account inflation rates, John was worth a modern equivalent of $110 billion, making him the sixteenth richest man in history.
Jeanette "Jennie" Jerome (1854-1921) was one of three pretty daughters of financier Leonard Jerome and his wife Clara. She married Lord Randolph Churchill, second son of the Duke of Marlborough. She had two children, Winston Churchill, the future prime minister, and John. She had many affairs during her marriage, including with King Edward VII. After her husband died, she married a man as young as her sons, which was very shocking for the time. She subsequently married an even younger man.
Henry of Bolingbroke, I Duke of Hereford, II Duke of Lancaster was born the only legitimate son of John of Gaunt (q.v.) in 1366. Gaunt, I Duke of Lancaster, was the second son of Edward III. His elder brother was known as the Black Prince, who died before he could become king.