The famous king of England who led the country during the Hundred Years' War was King Henry V. He reigned from 1413 to 1422 and is best known for his military leadership during the early part of the war against France. Henry V's most notable achievement was his victory at the Battle of Agincourt in 1415, where his outnumbered forces defeated the French army. His reign is often idealized for his charisma, leadership, and the establishment of English nationalism. Henry V's legacy is also immortalized in Shakespeare's plays, which portray him as a heroic and noble figure.