Answer
King Henry V of England, renowned for his military prowess and conquest of France, met his untimely demise in 1422. While leading his forces during the Hundred Years' War, he succumbed to illness, likely dysentery, at the young age of 35. Henry's death was a significant turning point in the conflict, marking the end of an era of uninterrupted English victories and precipitating a shift in momentum towards the French.