(Born March 6, 1340- Died March 15, 1399). Son of King Edward III and Philippa of Hainault. He had three wives, Blanche of Lancaster, Constance of Castile, and Katherine Swynford. He was the 1st Duke of Lancaster, the Duke of Aquitaine, King of Castile, and one of the wealthiest men of his time. His children would become the House of Lancaster, the Beauforts, the monarchs of Portugal and Castile, and the Hapsburgs.
John of Gaunt was the third surviving son of Edward III. He wasn’t supposed to be as wealthy or influential as he became but he achieved prestige by marrying well. With his first marriage to Blanche of Lancaster, John of Gaunt was able to become the first Duke of Lancaster. Blanche of Lancaster would die in 1369 and John would marry Constance of Castile in 1371. She was next in line for the throne of Castile and for years John fought for her crown against the Spanish. The problem was that they were also fighting the French as the Hundred Years’ War was just starting. After his brother Edward The Black Prince’s death in 1376, John took John Wycliffe under his protection as he now had more of a political influence.
When Edward III died, John of Gaunt’s nephew Richard II became king and John was his right hand man. There was a lot of mistrust with the nobility and the common folk which lead to the Peasants’ Revolt of 1381, which was quickly and brutally taken care of. John went back to Castile try to take the throne, but as soon as he left, England almost fell into civil war because of how poorly Richard II ruled. John gave up his claim to the Castilian throne to help bring England back to some stability.
He would also help sponsor Geoffrey Chaucer, who was his brother in law since Chaucer married the sister of John’s third wife and long time mistress, Katherine Swynford. John and Katherine met while he was married to Constance and had 4 children out of wedlock. After they were married in 1396, their children were made legitimate and given the name “Beaufort”. There was one catch, they were not allowed to inherit the throne, although their half- brother Henry IV allowed them to have some royal status. John of Gaunt died of natural causes on March 15, 1399 with Katherine Swynford by her side. He would later be buried by his first wife, Blanche of Lancaster.