John of Gaunt of Castile. As his father and elder brother, Edward, the Black Prince, became incapacitated due to poor health, Gaunt assumed control of many government functions, and rose to become one of the most powerful political figures in England. He was faced with military difficulties abroad and political divisions at home, and disagreements as to how to deal with these crises led to tensions between Gaunt, the English Parliament, and the ruling class, making him an extremely unpopular figure for a time. John exercised great influence over the English throne during the minority of King Richard II, and the ensuing periods
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,