John of Gaunt John of Gaunt John of Gaunt, Duke of Lancaster (6 March 13403 February 1399) was an English prince, military leader, and statesman. He was the third of the five sons of King Edward III of England who survived to adulthood. Due to his royal origin, advantageous marriages, and some generous land grants, Gaunt was one of the richest men of his era, and an influential figure during the reigns of both his father, Edward, and his nephew, Richard II. As Duke of Lancaster, he is the founder of the royal House of Lancaster, whose members would ascend to the throne
John of Gaunt Another motive was John's conviction that it was only by making peace with France would it be possible to release sufficient manpower to enforce his claim to the throne of Castile. On his return from France in 1374, John took a more decisive and persistent role in the direction of English foreign policy. From then until 1377, he was effectively the head of the English government due to the illness of his father and elder brother, who were unable to exercise authority. His vast estates made him the richest man in England, and his great wealth, ostentatious display of it,