King Henry V of England was born on September 16, 1386, and became king in 1413. He is best known for his military successes during the Hundred Years' War against France. His most famous victory came at the Battle of Agincourt in 1415, where his forces, though outnumbered, defeated the French army. Henry V was also known for his efforts to unite England and strengthen the monarchy. He implemented various reforms and promoted the use of the English language in government and law. His reign lasted until his death in 1422, leaving a legacy as one of England's notable warrior kings.