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Why did the birth of Edward, prince of Wales, threaten Richard, duke of York’s position?

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Wars of the Roses Illustration depicting the Battle of Bosworth Field, with King Richard III on the white horse.

The birth of Edward, Prince of Wales, in 1453 threatened the position of Richard, 3rd duke of York, because it provided a direct male heir to the Lancastrian king Henry VI, thereby securing the succession for the house of Lancaster.12

Prior to the prince's birth, Richard of York was the next in line to the throne, a position he held following the death of Humphrey, duke of Gloucester, in 1447. As a descendant of Edward III through the senior line of Lionel, duke of Clarence, York maintained a hereditary claim to the crown that he viewed as superior to that of the Lancastrian kings.12

The arrival of an infant prince meant that York was no longer the presumptive successor, which intensified the rivalry between him and the queen, Margaret of Anjou. Margaret viewed York as a dangerous threat to her son’s future and actively worked to exclude him from power, ultimately precipitating the Wars of the Roses.12