John of Gaunt was an English nobleman who had an estimated net worth of $110 billion.

John of Gaunt was known by the title of Duke of Lancaster on November 12, 1362. During that time, he owned more thirty castles and estates in England and France.

When the war broke out in France in 1369, Gaunt was sent to Calais with the Earl of Hereford wherein they raided northern France.

To reinforce his brothers, the Black Prince and Edmund of Langley in Aquitaine, he sent an army to the area in 1370. When the siege of Limoges ended, the Black Prince went back to England after surrendering his lordship of Aquitaine.

In 1373, John was one of the people who led peace negotiations which led to the Anglo-French Congress of Bruges.

He claimed the throne of Castile in 1386, when he married his second wife, Constance. Upon his return to England in 1389, he persuaded the Lords Appellant and King Richard to compromise in their negotiations.

John of Gaunt was born on March 6, 1340 in Ghent, Flanders.  He married three times and had fourteen children. He died on February 3, 1399 in Leicester Castle, Leicestershire.