Sir John Bourchier was an English nobleman and military leader during the late 15th century. He is best known for his role in the Wars of the Roses, a series of civil wars for control of the English throne. Bourchier was a supporter of the House of York and played a significant part in various battles, including the decisive Battle of Towton in 1461. In addition to his military contributions, Bourchier held several important titles, including Lord Berners. He was also known for his diplomatic skills, serving as an ambassador to France and other countries. His legacy is marked by his commitment to the Yorkist cause and his influence in the political landscape of his time.